mla citation of an article in text

In-Text Citations: An Overview

In-text citations are brief, unobtrusive references that direct readers to the works-cited-list entries for the sources you consulted and, where relevant, to the location in the source being cited.

An in-text citation begins with the shortest piece of information that di­rects your reader to the entry in the works-cited list. Thus, it begins with what ever comes first in the entry: the author’s name or the title (or descrip­tion) of the work. The citation can appear in your prose or in parentheses.

Citation in prose  Naomi Baron broke new ground on the subject. Parenthetical citation At least one researcher has broken new ground on the subject (Baron). Work cited Baron, Naomi S. “Redefining Reading: The Impact of Digital Communication Media.” PMLA , vol. 128, no. 1, Jan. 2013, pp. 193–200. 

When relevant, an in-text citation also has a second component: if a specific part of a work is quoted or paraphrased and the work includes a page number, line number, time stamp, or other way to point readers to the place in the work where the information can be found, that location marker must be included in parentheses.

Parenthetical citation According to Naomi Baron, reading is “just half of literacy. The other half is writing” (194).

The author or title can also appear alongside the page number or other loca­tion marker in parentheses.

Parenthetical citation Reading is “just half of literacy. The other half is writing” (Baron 194).

All in-text references should be concise. Avoid, for instance, providing the author’s name or title of a work in both your prose and parentheses.

Citation (incorrect) According to Naomi Baron, reading is “just half of literacy. The other half is writing” (Baron 194). Citation (correct) According to Naomi Baron, reading is “just half of literacy. The other half is writing” (194).

For more on what to include in an in-text citation and how to style it, see sections 6.3–6.30 of the ninth edition of the MLA Handbook ).

55 Comments

Brandi unruh 10 april 2021 at 11:04 am.

Hello! I am a high school English teacher trying to answer a question that came up during our research unit. I can’t seem to find a definitive answer online. When using a shortened title in an in-text citation, does an ellipsis need to be included? For example, if the title was “The Problem of Poverty in America: A Historical and Cultural Analysis”, would the in-text citation be (“The Problem of Poverty in America...”) or (“The Problem of Poverty in America”)? Thank you for your time and expertise!

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Laura Kiernan 12 April 2021 AT 11:04 AM

No, an ellipsis would not be used in an in-text citation. We provide extensive guidance on shortening titles in 6.10 of the new ninth edition of the MLA Handbook .

angel 10 May 2021 AT 02:05 PM

hii How to write an in text citation of an entry from encyclopedia which has an editor but no separate authors for each entry ?

William Feeler 11 May 2021 AT 01:05 PM

I see no mention of paragraph numbers for unpaginated prose or sections/lines for drama. are these practices gone?

Laura Kiernan 18 May 2021 AT 01:05 PM

This post provides a general overview of our approach to in-text citations. The complete guidelines appear in sections 6.1–6.30 of the ninth edition of the MLA Handbook .

Vonceil Park 11 May 2021 AT 01:05 PM

Dear MLA Staff, A professor at my College demands students to provide paragraph number in the in-text citation for online articles that have no page number nor paragraph number. Do we just count the paragraph number and put them in the parenthesis, for example: (para. 3)?

Laura Kiernan 18 May 2021 AT 12:05 PM

Thank you for your question. Your approach to modifying our style in accordance with your professor's instructions works, but we would suggest confirming that styling with your professor.

Arathi Babu 17 May 2021 AT 08:05 AM

How to write an in text citation of an unsigned entry from a reference work?

Laura Kiernan 08 June 2021 AT 11:06 AM

If the entry was in a print work, the in-text citation would include the entry’s title or a shortened version of the entry’s title and the page number of the quotation. If the entry was in a reference work without page numbers, the in-text citation should just contain the title or shortened title of the entry.

Sethu 17 May 2021 AT 02:05 PM

For example: Can I give an in-text citation like the following: Shakespeare, in his work Hamlet, quotes: "To be or not to be" (7).

For citing commonly studied verse works, see 6.22 in the ninth edition of the MLA Handbook .

Trinity Klein 21 May 2021 AT 11:05 AM

Can you please help with proper in-text citation placement for an embedded quotation? Does the citation come immediately after the quotation or at the very end of the sentence? For example, is this correct: He asks her to take him home “in the voice of a child afraid of the dark” which comes as a shock to Scout because he has so long held a bold and rebellious reputation (372). Or should the (372) come immediately after ...dark"...? Thank you!

For more information about the placement of a parenthetical citations, see 6.43 in the ninth edition of the MLA Handbook .

Karima 30 May 2021 AT 05:05 PM

Dear MLA staff, 1) In case i am quoting from multiple sources by the same author, am i required to introduce again the source i am quoting from in the beginning of my sentence? (Quotes are used in multiple paragraphs)

For guidance on citing multiple sources by the same author, see 6.8 in the ninth edition of the MLA Handbook .

Yves 23 June 2021 AT 06:06 PM

Hello, is there a specific rule about how to format a range of page numbers in the parenthetical citation? For example, could (Eden 44-45) be written as (Eden 44-5), or is only one example correct?

Laura Kiernan 24 September 2021 AT 02:09 PM

For information about styling number ranges, see section 2.139 of the ninth edition of the MLA Handbook .

Faliravo 11 August 2021 AT 05:08 AM

Good morning MLA team, My professor insists that I include the year of publication for in-text citations. Is it going to be okay if I insert the year between the author and the page number?

Thank you very much for your consideration.

Laura Kiernan 24 September 2021 AT 01:09 PM

Your approach to modifying our style in accordance with your professor’s instructions works, but we would suggest confirming that styling with your professor.

Pauline 14 September 2021 AT 11:09 PM

How do I cite an entire work. For example, if I want to say Toni Morrison's the "Bluest Eye" has been used as a textbook for many English literature classes, I suppose I shouldn't put any page number in the parenthetical citation. But I can't find any MLA references on this.

See section 4.14 of the ninth edition of the MLA Handbook .

myron glassenberg 04 February 2022 AT 01:02 PM

if source is the whole book, how do I cite in text and in works cited pages. e.g. freud (no page number) Freud , ( 1892) The Pleasure Principle.

Rita Rozzi 20 September 2023 AT 07:09 PM

There is no section 4.14 in the ninth edition. Do you have any updated information? Thank you.

Laura Kiernan 21 September 2023 AT 03:09 PM

Section 4.14, which is titled "Passing Mentions," can be found in chapter 4 of the ninth edition of the handbook.

Lauren McFall 13 October 2021 AT 02:10 PM

Students often refer to the same source consecutively across more than one sentence. I'm having a hard time finding information about the preferred approach according to the MLA. As a parallel, APA makes a specific recommendation - "cite the source in the first sentence in which it is relevant and do not repeat the citation in subsequent sentences as long as the source remains clear and unchanged" https://apastyle.apa.org/style-grammar-guidelines/citations/appropriate-citation

Laura Kiernan 20 October 2021 AT 04:10 PM

See 6.45 of the ninth edition of the MLA Handbook .

Ruth Schafer 01 December 2022 AT 07:12 PM

6.45 out of the MLA Handbook's ninth edition does not provide an example of how to cite a multi-sentence paraphrase when using an unpaginated source. Can you give an example of how to cite a multi-sentence paraphrase where the source does not have published page numbering?

Should I introduce the source in my prose and then again at the end of the multi-sentence paraphrase in parentheses when I have finished citing the paraphrase? Example: John Smith from Smith Architecture explains that crawl space foundations are...blah blah blah. These foundations are most commonly used in midwestern constructions where the frost line is...blah, blah, blah. Keep writing the paraphrase and then at the end of the final sentence instead of a page citation write the author's last name (Smith). This way if you switch to a different source, at least the reader knows that you have finished with the Smith source and have moved on to your own commentary or another source's information. Usually, I'd use a page citation at the end of the paraphrase, but when dealing with a source that does not have page numbering, I'm unsure what to do.

Lizzie 18 October 2021 AT 10:10 PM

If I only use textual evidence from the novel I'm examining, do I need to include the authors name with each in text citation? There are no other works cited, so it seems redundant/clutter-y to me

Kayden 29 October 2021 AT 05:10 PM

If I'm trying to cite multiple paragraphs from the same source would it be correct to say (par. 3 and 13) or should it be (par. 3, 13) and is it different if they are next to each other too like (par. 6-7) or (par. 6 and 7).

Laura Kiernan 04 November 2021 AT 11:11 AM

See sections 6.18–6.20 of the ninth edition of the MLA Handbook .

Rachel 17 November 2021 AT 01:11 PM

When citing from an online source without pagination, if you include the author's name in the introduction to the quote, do you need to include anything in parentheses like the article title?

Laura Kiernan 22 November 2021 AT 12:11 PM

See section 6.26 of the ninth edition of the MLA Handbook .

July 25 November 2021 AT 05:11 PM

When quoting an online source (e.g. a website), do I have to indicate the fact that it's an online source in the in-text-citations as in (Name [online]) or is the author's name enough?

Thank you in advance for your answer.

Laura Kiernan 29 November 2021 AT 10:11 AM

According to MLA style, an in-text citation for an online work should not note that the work is online.

Pinkie 19 March 2022 AT 08:03 PM

If I'm writing a response paper, and I need to summarize the whole article to introduce it, then should I use in-text citation?

Laura Kiernan 25 March 2022 AT 01:03 PM

For guidance on paraphrasing, see sections 4.5–4.8 of the ninth edition of the MLA Handbook .

Kay 09 April 2022 AT 06:04 PM

Hi, am I supposed to include the DOI when one is available in the citation? If I cite the print version of a journal article that has a DOI, still include the DOI in the citation? Thank you!

Laura Kiernan 11 April 2022 AT 11:04 AM

Thank you for your questions. For guidance on including a DOI in your works-cited-list entry, see sections 5.84 and 5.93 in the ninth edition of the MLA Handbook .

Mike 16 April 2022 AT 05:04 PM

Website in-text Citation...

When I'm writing an in-text citation for a website, I'm seeing all manner of different things to include. Do I need to add the author name and year of publishing for the article?\ Do I just need the website name? I'm not really understanding what I need to add or obtain for such a citation within the text I'm writing.

I'm writing a book on my life, and I'm quoting a particular webpage to show one particular angle of an argument I'm making, and, of course, it's not common knowledge, so I want to make sure that I follow all the rules for this kind of thing, so I don't get in trouble with the author(s) of the sources I have quoted from...

Laura Kiernan 18 April 2022 AT 02:04 PM

Thank you for your questions about MLA style. For guidance on in-text citations for web pages, see section 6.26 of the ninth edition of the MLA Handbook .

Cynthia 21 May 2022 AT 10:05 PM

When you're doing an In-text citations do you put the quotations over the chapter title and then quotations over what you get from the text or do you italicize the title?

Laura Kiernan 25 May 2022 AT 03:05 PM

Thank you for your question. For guidance on how to style chapter titles, see 2.109 of the ninth edition of the MLA Handbook .

Napatsi 15 August 2022 AT 07:08 PM

I'm trying to find how to put in the in-text citation for a UN declaration article but can only find the "Resolutions of International Governing Bodies" on page 446 of the 9th edition but not how to out it in without an author.

Kim 27 September 2022 AT 12:09 PM

I'm quoting a passage from an unpublished manuscript, and it is not the only work I'm citing by the author, but the only one without a year. So using "Smith 1995, 82" is not possible. What would an in-text citation for this case look like?

Jen 17 November 2022 AT 08:11 PM

How do I cite a news cast for in-text citation like ABC News?

Samantha 04 December 2022 AT 05:12 PM

Hi, For MLA format, should a quote where you need to de-capitalize the first letter be written as "you want" or "(y)ou want". Thanks!

Laura Kiernan 07 December 2022 AT 01:12 PM

Thank you for your question. For guidance on how to indicate that you have lowercased the first letter of a quotation, see 6.56 of the ninth edition of the MLA Handbook .

Maria Albeti 07 February 2023 AT 01:02 PM

Stewart, David W. Focus groups. In: Frey, B.B. (ed.) The SAGE Encyclopedia of Educational Research, Measurement, and Evaluation, vol. 2, pp. 687–692. Thousand Oaks: Sage Publications 2018 In this case, how is the correct form to write, because the article is IN the the book?

Eros Karadzhov 15 February 2023 AT 02:02 PM

If we have a sentence that is a statement, but at the end we quote a question, which punctuation mark do we keep, the question mark or the period; maybe both? Example: (1) The author ends his poem with the following question on purpose: "Or does it explode?" (Hughes 11). (2) The author ends his poem with the following question on purpose: "Or does it explode" (Hughes 11)?

Which would be correct, or maybe both are wrong?

Thank you in advance!

Laura Kiernan 16 February 2023 AT 03:02 PM

Thank you for your question. For guidance on quotations ending in a question mark, see section 6.53 of the ninth edition of the MLA Handbook .

Anonymous 08 March 2023 AT 05:03 PM

What about online articles with no known author or multiple authors? What should the in-text citation look like?

Maria 25 March 2023 AT 04:03 PM

Please settle a dispute with my colleagues. I encourage composition students to avoid listing the title of journal articles within the essay unless it is especially relevant because it clutters their arguments. I came to this conclusion from my interpretation of this statement from MLA: "All in-text references should be concise. Avoid, for instance, providing the author’s name or title of a work in both your prose and parentheses." Could someone please provide an answer or further clarification?

Erika Suffern 30 March 2023 AT 04:03 PM

You are right to identify a principle of concision in our guidelines. That said, it is not wrong to mention a title in prose, but it should be done, as you note, when relevant–not as a de rigeur practice or for “filler.” As Eric Hayot notes in The Elements of Academic Style: Writing for the Humanities (Columbia UP, 2014), “giving the title” in prose “suggests fuller forthcoming treatment” (159). Another reason for including the title in prose might be to call attention to something about it. Many writers who do mention a title in prose fear having an incomplete citation and are tempted also to include the title in a parenthetical reference, which is unnecessary.

Jay 29 April 2023 AT 12:04 AM

How do I in-text cite a direct quote from the introduction of an ebook with no page numbers? Would I write (Author "Introduction") or just write (Author)?

Kiara 11 February 2024 AT 03:02 PM

Hello! I am a university student who is currently creating works cited entries and in-text citations for a reflection essay. How do I properly cite professor and peer comments?

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Using In-text Citation

Include an in-text citation when you refer to, summarize, paraphrase, or quote from another source. For every in-text citation in your paper, there must be a corresponding entry in your reference list.

MLA in-text citation style uses the author's last name and the page number from which the quotation or paraphrase is taken, for example: (Smith 163). If the source does not use page numbers, do not include a number in the parenthetical citation: (Smith).

For more information on in-text citation, see the MLA Style Center .

Example paragraph with in-text citation

A few researchers in the linguistics field have developed training programs designed to improve native speakers' ability to understand accented speech (Derwing et al. 246; Thomas 15). Their training techniques are based on the research described above indicating that comprehension improves with exposure to non-native speech. Derwing and others conducted their training with students preparing to be social workers, but note that other professionals who work with non-native speakers could benefit from a similar program (258).

Works Cited List

Derwing, Tracey M., et al. "Teaching Native Speakers to Listen to Foreign-accented Speech." Journal of Multilingual and Multicultural Development, vol. 23, no. 4, 2002, pp. 245-259.

Thomas, Holly K.  Training Strategies for Improving Listeners' Comprehension of Foreign-accented Speech. University of Colorado, Boulder, 2004.

Citing Web Pages In Text

Cite web pages in text as you would any other source, using the author if known. If the author is not known, use the title as the in-text citation.

Your in-text citation should lead your reader to the corresponding entry in the reference list. Below are examples of using in-text citation with web pages.

Entire website with author: In-text citation Parents play an important role in helping children learn techniques for coping with bullying (Kraizer).

Works cited entry Kraizer, Sherryll. Safe Child. Coalition for Children, 2011, www.safechild.org.

Web page with no author: In-text citation The term Nittany Lion was coined by Penn State football player Joe Mason in 1904 ("All Things Nittany").

Works cited entry "All Things Nittany." About Penn State. Penn State University, 2006, www.psu.edu/ur/about/nittanymascot.html.

General Guidelines

In MLA style the author's name can be included either in the narrative text of your paper, or in parentheses following the reference to the source.

Author's name part of narrative:

Gass and Varonis found that the most important element in comprehending non-native speech is familiarity with the topic (163).

Author's name in parentheses:

One study found that the most important element in comprehending non-native speech is familiarity with the topic (Gass and Varonis 163).

Group as author: (American Psychological Association 123)

Multiple works: (separate each work with semi-colons)

Research shows that listening to a particular accent improves comprehension of accented speech in general (Gass and Varonis 143; Thomas 24).

Direct quote:

One study found that “the listener's familiarity with the topic of discourse greatly facilitates the interpretation of the entire message” (Gass and Varonis 85).

Gass and Varonis found that “the listener’s familiarity with the topic of discourse greatly facilitates the interpretation of the entire message” (85).

Note: For quotations that are more than four lines of prose or three lines of verse, display quotations as an indented block of text (one inch from left margin) and omit quotation marks. Place your parenthetical citation at the end of the block of text, after the final punctuation mark.

In addition to awareness-raising, practicing listening to accented speech has been shown to improve listening comprehension. This article recommends developing listening training programs for library faculty and staff, based on research from the linguistics and language teaching fields. Even brief exposure to accented speech can help listeners improve their comprehension, thereby improving the level of service to international patrons. (O'Malley 19)

Works by Multiple Authors

When citing works by multiple authors, always spell out the word "and." When a source has three or more authors, only the first one shown in the source is normally given followed by et al.

One author: (Field 399)

Works Cited entry: Field, John. "Intelligibility and the Listener: The Role of Lexical Stress." TESOL Quarterly , vol. 39, no. 3, 2005, pp. 399-423.

Two authors: (Gass and Varonis 67)

Works Cited entry: Gass, Susan, and Evangeline M. Varonis. "The Effect of Familiarity on the Comprehensibility of Nonnative Speech." Language Learning , vol. 34, no. 1, 1984, pp. 65-89.

Three or more authors: (Munro et al. 70)

Works Cited entry: Munro, Murray J., et al. "Salient Accents, Covert Attitudes: Consciousness-raising for Pre-service Second Language Teachers." Prospect , vol. 21, no. 1, 2006, pp. 67-79.

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In-text citations are inserted in the body of your research paper to briefly document the source of your information. 

• In-text citations in MLA style follow the general format of author's last name followed by a page number enclosed in parentheses. Here is an example: "Here's a direct quote" (Smith 8).
• If the author's name is not given, use the first word (or words) of the title. Follow the same formatting that is used in the works-cited list, such as quotation marks. Here is an example: This is a paraphrase ("Trouble" 22).
• If the source does not have page numbers (for example, some online articles, websites and e-books), only include the author's name for the in-text citation. Do not estimate or make up page numbers.  
• In-text citations point the reader to the works-cited list, which is located at the end of your paper, for more complete bibliographic information.

Repeated Use of Sources

If you use information from a single source more than once in succession (i.e., no other sources referred to in between), you can use a simplified in-text citation. Here is an example:

Cell biology is an area of science that focuses on the structure and function of cells (Smith 15). It revolves around the idea that the cell is a "fundamental unit of life" (17).

  Note: If using this simplified in-text citation creates ambiguity regarding the source being referred to, use the full in-text citation format.

In-Text Citation Formatting and Examples

Format:  (Author's Last Name Page Number)

Example: (Hunt 358)

Two Authors

Format:  (Author's Last Name and Author's Last Name Page Number)

Example: (Case and Daristotle 57)

Three or More Authors

Format:   (Author's Last Name et al. Page Number)

Example: (Case et al. 57)

Unknown Author

Where you would normally put the author's last name, instead use the first one, two, or three words from the title. Do not use  initial articles such as "A", "An" or "The". Provide enough words to clarify which sources from your works-cited list that you are referencing. 

Follow the formatting of the title. For example, if the title in the works-cited list is in italics, italicize the words from the title in the in-text citation, and if the title in the works-cited list is in quotation marks, put quotation marks around the words from the title in the in-text citation.

Format: (Title Page Number)

Examples : 

( Cell Biology 12)

("Nursing" 12)

Multiple Sources

To cite more than one source when you are paraphrasing, separate the in-text citations with a semi-colon.

Format: (Author's Last Name Page Number; Author's Last Name Page Number).

(Smith 42; Bennett 71). 

( It Takes Two ; Brock 43).

 Note: In MLA style, the sources within the in-text citation do not need to be in alphabetical order.

Works Quoted in Another Source

Sometimes an author of a book, article or website will mention another person's work by using a quotation or paraphrased idea from that source. (This may be a secondary source.) For example, the Kirkey article you are reading includes a quotation by Smith that you would like to include in your essay. The basic rule is that in both your Works-Cited List and in-text citation you will still cite Kirkey. Kirkey will appear in your Works Cited list – NOT Smith. Add the words "qtd. in" to your in-text citation.

Examples of in-text citations:

According to a study by Smith (qtd. in Kirkey) 42% of doctors would refuse to perform legal euthanasia.

Smith (qtd. in Kirkey) states that “even if euthanasia was legal, 42% of doctors would be against this method of assisted dying” (A.10).

Example of Works Cited List citation:

Kirkey, Susan. "Euthanasia."   The Montreal Gazette , 9 Feb. 2013, p. A.10. Canadian Newsstand Major Dailies.

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MLA In-text Citations - The Basics

In MLA, referring to the works of others within text of your paper is done using  parenthetical citations . This means placing relevant source information in parentheses whenever a sentence uses a quotation or paraphrase. Usually, the simplest way is to put all of the source information in parentheses at the end of the sentence (i.e., just before the period). However, as seen below, there are situations where it makes sense to put the parenthetical elsewhere in the sentence, or even to leave information out.

General Guidelines

• upon the source medium (e.g. print, web, DVD)
• upon the source’s entry on the Works Cited page.
• Any source information that you provide in-text must correspond to the source information on the Works Cited page. More specifically, whatever signal word or phrase you provide to your readers in the text must be the first thing that appears on the left-hand margin of the corresponding entry on the Works Cited page. This is so your reader can connect your in-text citation to the right line in your Works cited page.
• Be sure to check the full selection of examples for in-text citations below, they vary slightly depending on the type of source you are citing.

MLA in-text citations

MLA format follows the author-page method of in-text citation. This means that the author's last name and the page number(s) from which the quotation or paraphrase is taken must appear in the text, and a complete reference should appear on your Works Cited page. The author's name may appear either in the sentence itself or in parentheses following the quotation or paraphrase, but the page number(s) should always appear in the parentheses, not in the text of your sentence. For example:

• Wordsworth stated that Romantic poetry was marked by a "spontaneous overflow of powerful feelings" (263).
• Romantic poetry is characterized by the "spontaneous overflow of powerful feelings" (Wordsworth 263).
• Wordsworth extensively explored the role of emotion in the creative process (263).

Both citations in the examples above, (263) and (Wordsworth 263), tell readers that the information in the sentence can be located on page 263 of a work by an author named Wordsworth. If readers want more information about this source, they can turn to the Works Cited page, where, under the name of Wordsworth, they would find the following information:

• Wordsworth, William.  Lyrical Ballads . Oxford UP, 1967.

While the above is the general rule, there are some variations depending on the source of the quote or paraphrase. Here are a few examples, but please review the MLA Manual of Style for more detailed and specific information about in-text citations.

In-text citations by type

• Print Sources - Known author
• Print Sources - Corporate author
• Print Sources - No known author
• Classic works with multiple editions
• Works in an anthology
• Multiple authors
• Multiple works by same author
• Multivolume works
• Web sources

For print sources like books, magazines, scholarly journal articles, and newspapers, provide a signal word or phrase (usually the author’s last name) and a page number. If you provide the signal word/phrase in the sentence, you do not need to include it in the parenthetical citation.

• Human beings have been described by Kenneth Burke as "symbol-using animals" (3).
• Human beings have been described as "symbol-using animals" (Burke 3).

These examples must correspond to an entry that begins with Burke, which will be the first thing that appears on the left-hand margin of an entry on the Works Cited page:

• Burke, Kenneth.  Language as Symbolic Action: Essays on Life, Literature, and Method . University of California Press, 1966.

When a source has a corporate author, it is acceptable to use the name of the corporation followed by the page number for the in-text citation. You should also use abbreviations (e.g., nat'l for national) where appropriate, so as to avoid interrupting the flow of reading with overly long parenthetical citations.

• Climate change is now "an important factor in developing new engineering systems" (EPA 321).
• The EPA has stated in a recent study, Climate change is now " an important factor in developing new engineering systems" (321). 

When a source has no known author, use a shortened title of the work instead of an author name, following these guidelines.

• Place the title in quotation marks if it's a short work (such as an article), or italicize it if it's a longer work (e.g. plays, books, television shows, entire Web sites) and provide a page number if it is available.

Titles that are longer than a standard noun phrase should be shortened into a noun phrase by excluding articles. For example,  To the Lighthouse  would be shortened to just  Lighthouse .

If the title cannot be easily shortened into a noun phrase, the title should be cut after the first clause, phrase, or punctuation:

• The world needs to act to reverse climate change, because it "is here, and it’s causing a wide range of impacts that will affect virtually every human on Earth in increasingly severe ways. . . ." ("Climate Impacts").

In this example, since the reader does not know the author of the article, an abbreviated title appears in the parenthetical citation, and the full title of the article appears first at the left-hand margin of its respective entry on the Works Cited page. Thus, the writer includes the title in quotation marks as the signal phrase in the parenthetical citation in order to lead the reader directly to the source on the Works Cited page. The Works Cited entry appears as follows:

• "Climate Impacts."  Union of Concerned Scientists . 2022. www.ucsusa.org/climate/impacts. Accessed 24 Mar. 2022.

If the title of the work begins with a quotation mark, such as a title that refers to another work, that quote or quoted title can be used as the shortened title. The single quotation marks must be included in the parenthetical, rather than the double quotation.

Page numbers are always required, but additional information can help literary scholars, who may have a different edition of a classic work, like Marx and Engels's  The Communist Manifesto .

In these cases, give the page number from your edition (making sure the edition is listed in your Works Cited page, of course) followed by a semicolon, and then the appropriate abbreviations for volume (vol.), book (bk.), part (pt.), chapter (ch.), section (sec.), or paragraph (par.). For example:

• Marx and Engels described human history as marked by class struggles (79; ch. 1).

When you cite a work that appears inside a larger source (for instance, an article in a periodical or an essay in a collection), cite the author of the  internal  source (i.e., the article or essay). For example, to cite Albert Einstein's article "A Brief Outline of the Theory of Relativity," which was published in  Nature  in 1921, you might write something like this:

• Relativity's theoretical foundations can be traced to earlier work by Faraday and Maxwell (Einstein 782).

For a source with two authors, list the authors’ last names in the text or in the parenthetical citation:

• Best and Marcus argue that one should read a text for what it says on its surface, rather than looking for some hidden meaning (9).
• The authors claim that surface reading looks at what is “evident, perceptible, apprehensible in texts” (Best and Marcus 9).

For a source with three or more authors, list only the first author’s last name, and replace the additional names with et al (which means "and others")

• According to Franck et al., “Current agricultural policies in the U.S. are contributing to the poor health of Americans” (327).
• The authors claim that one cause of obesity in the United States is government-funded farm subsidies (Franck et al. 327).

If you cite more than one work by an author, include a shortened title for the particular work from which you are quoting to distinguish it from the others. Put short titles of books in italics and short titles of articles in quotation marks.

Citing two articles by the same author:

• Lightenor has argued that computers are not useful tools for small children ("Too Soon" 38), though he has acknowledged elsewhere that early exposure to computer games does lead to better small motor skill development in a child's second and third year ("Hand-Eye Development" 17).

Citing two books by the same author:

• Murray states that writing is "a process" that "varies with our thinking style" ( Write to Learn  6). Additionally, Murray argues that the purpose of writing is to "carry ideas and information from the mind of one person into the mind of another" ( A Writer Teaches Writing  3).

**Additionally, if the author's name is not mentioned in the sentence, format your citation with the author's name followed by a comma, followed by a shortened title of the work, and, when appropriate, the page number(s):

• Visual studies, because it is such a new discipline, may be "too easy" (Elkins, "Visual Studies" 63).

If you cite from different volumes of a multivolume work, always include the volume number followed by a colon. Put a space after the colon, then provide the page number(s). (If you only cite from one volume, provide only the page number in parentheses.)

• . . . as Quintilian wrote in  Institutio Oratoria  (1: 14-17).

In your first parenthetical citation referencing the bible, you want to make clear which bible you're using (and underline or italicize the title), as each version varies in its translation, followed by book (do not italicize or underline), chapter, and verse. For example:

• Ezekiel saw "what seemed to be four living creatures," each with faces of a man, a lion, an ox, and an eagle ( New Jerusalem Bible , Ezek. 1.5-10).

If future references are to the same edition of the bible you’re using, list only the book, chapter, and verse in the parenthetical citation:

• John of Patmos echoes this passage when describing his vision (Rev. 4.6-8).

For electronic and Internet sources, follow the following guidelines:

• Include in the text the first item that appears in the Work Cited entry that corresponds to the citation (e.g. author name, article name, website name, film name).
• Do not provide paragraph numbers or page numbers based on your Web browser’s print preview function.
• Unless you must list the Web site name in the signal phrase in order to get the reader to the appropriate entry, do not include URLs in-text. Only provide partial URLs such as when the name of the site includes, for example, a domain name, like  CNN.com  or  Forbes.com,  as opposed to writing out http://www.cnn.com or http://www.forbes.com.
• One online film critic stated that  Fitzcarraldo  "has become notorious for its near-failure and many obstacles" (Taylor, “Fitzcarraldo”)
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MLA in-text citations

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In-text citations are a brief version of citations that are used to provide information about the sources being referred to by the authors. They are used in the text to indicate to the reader that complete information of the citations referred to is available in the works-cited list, which will enable a reader to locate or access the sources being cited.

The basic element needed for an in-text citation is the author’s name . The publication year is not required in in-text citations. Sometimes, page numbers or line numbers are also included, especially when text is quoted from the source being cited. In-text citations are mentioned in the text in two ways: citations in prose and parenthetical citations.

Citation in prose

Citations in prose are in-text citations where some of the citation information is incorporated into the text as a part of the sentence. Usually, the author’s full name is included naturally in the text (instead of in a parenthetical citation). Thereafter, only the surname is used. Here’s an example of a citation in prose (first mention of the author):

Christopher Arp identifies the geography of Alaska lake districts.

Parenthetical citation

Parenthetical citations are in-text citations that add source information at the end of a sentence in parenthesis. Here’s one example of a parenthetical citation:

The geography of Alaska lake districts is identified (Arp).

When and how to include other components

When you quote text from a source word-for-word, try to include the location of the quote. Usually, this is the page number of where the quote is found. If including a page number, there is no need to include page, p., or pp. before the page number. Here’s an example of a quotation with a page number indicated:

According to Ann Fienup-Riordan, “ Fieldwork Turned on Its Head ” (15).

For other types of sources, use other relevant indicators. For example, use a paragraph number if there are no pages or a time stamp for a video.

In-text citations should be concise. Do not repeat author names in parenthesis if the name is mentioned in the text. If you want to cite a chapter number, a scene, or a line number, follow the below guidelines:

Citation in prose:

Parenthetical citation:

Examples of in-text citations with different numbers of authors

Here are a few examples of in-text citations for different numbers of authors:

Use both the first name and surname of the author if you are mentioning the author for the first time in the prose. In subsequent occurrences, use only the author’s surname. Always use the surname of the author in parenthetical citations.

1st mention:   Randall Hill studies ….

subsequent mentions:    Hill explores ….

Parenthetical:

Two authors

Use the first name and surname of both authors if you are mentioning the work for the first time in the prose. In subsequent occurrences, use only the surnames of the two authors. Always use only the surnames of the authors in parenthetical citations. Use “and” to separate the two authors in parenthetical citations.

1st mention:   Magda Miranda and Rea Dennis ….

subsequent mentions:   Miranda and Dennis ….

….(Miranda and Dennis)

Three or more authors

For citations in prose, use the first name and surname of the first author followed by “and others” or “colleagues.” In parenthetical citations, use only the surname of the first author followed by “et al.”

Alice Rearden et al. and colleagues…. or Alice Rearden and others ….

….(Rearden et al.)

Corporate author

For citations in prose, treat the corporate author similar to how you would treat author names. For parenthetical citations, shorten the organization name wherever possible.

The Academy of American Poets….

….(American Poets)

If there is no author for the source, use the source title in place of the author’s name for both citations in-prose and parenthetical citations.

When you add such in-text citations, italicize the text. If the source title is too long, use a shortened version of the title in the prose.

Sticky Performances exhibits …. (89)

….( Sticky 89)

Citing special cases

Works having the same surname(s), different first name(s).

If two or more entries in the works-cited list have the same surname, use the first name, not only in the first mention, but also in subsequent occurrences in prose to avoid confusion. In parenthetical citations, include the first initials of the author.

Citation in prose templates:

First name Surname of the first author

First name Surname of the second author

Citation prose examples:

Steve Baker

Parenthetical templates:

(A. Author Surname)

(B. Author Surname)

Parenthetical examples:

If the first initials are also the same, use full first name in parenthetical citations too.

(Cheng Lee)

Works by the same author(s)

If two or more entries in the works-cited list are contributions of the same author(s), add the title in in-text citations to help the reader locate the source you are citing. If the title is long, you can use a shortened title.

Arlander says in The Peregrine that ….

There are different kinds of birds and a distinct species is studied (Arlander, The Peregrine )

Works listed by title

If the works-cited-list entry has a source listed by the title, use the title in both citations in prose and parenthetical citations. If the title is long, you can use a short title.

Interview with Anna Deveare Smith reveals ….

( Anna Deveare Smith )

Punctuation in parenthetical citations

Do not introduce any punctuation between the author’s name and the page number.

(Scott 102)

If you want to include more page numbers, separate them by commas.

(Sagar 112, 121–24, 129)

If the number introduced is other than a page number (e.g., line number, chapter number, paragraph number), add the label before the number. Use a comma after the author’s name.

(Dcosta, par. 4)

If you want to cite a specific part on a page, separate the part from the page number by a semicolon. Multiple parts, if referred, are separated by commas.

(Bellana 127; par. 41, lines 6–8)

If you introduce multiple citations, separate them by semicolons.

(Milinda 23; Jacob 47)

If you need to insert a title, separate the author name and the title by a comma. However, do not introduce any punctuation between the title and the page number.

(Rich, Painful Stories 128)

If you cite two works by the same author, separate the titles by “and.” For more than two works by the same author, separate the titles by commas, but add “and” along with a serial comma before the last title.

(Gleason, “Great Migration” and “Appalachian Affects”)

(Brisini, “Practice,” “Precarity,” and “Phytomorphizing”)

Resource Types

For additional information on MLA format, select from one of the resource types below. For help creating MLA citations, check out the BibMe MLA citation generator .

• How to cite a Book in MLA
• How to cite a Magazine in MLA
• How to cite a Newspaper in MLA
• How to cite a Website in MLA
• How to cite a Journal Article in MLA
• How to cite a Movie in MLA
• How to cite an Interview in MLA
• How to cite a Lecture in MLA
• How to cite a TV Show / Radio Broadcast in MLA
• How to cite an Encyclopedia in MLA
• How to cite a Photograph in MLA

MLA Format:

• In-Text Citation Basics
• Works Cited Page

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• Research guides

MLA 9 Quick Guide

In-text citations, page contents.

Direct Quoting

Paraphrasing

Citing a source cited in your source, citing a web page.

Basic Rules for In-Text Citations:

• In all cases, create a citation that is brief and that unambiguously  directs the reader to the right entry on your Works Cited page.
• Use the author's last name and page number(s) when available for paraphrases & quotes; just the author's name is sufficient for summarizing the gist of an entire work.
• Put the author's name either within within the text of the sentence or in parentheses . If in the text of the sentence, only the page number is put in parentheses.
• If there is no page number , use whatever location marker is available: paragraph numbers, line numbers, chapter and/or section, or time-stamp (for video or audio). If there is no page number or other location, simply omit it.
• If the source is attributed to an organization , use a "corporate" (or group) author, such as "U.S. Government Printing Office," or "American Library Association."
• If there is no author (not even a corporate author), use an abbreviated form of the work's title in the citation.

Direct Quote & Paraphrase

1. Author's name in text

According to Naomi Baron , reading is "just half of literacy. The other half is writing" (194) . One might even suggest that reading is never complete without writing.

2. Author's name in parentheses

Reading is just "half of literacy. The other half is writing"  (Baron 194) . One might even suggest that reading is never complete without writing.

Baron, Naomi S. "Redefining Reading: The Impact of Digital Communication Media." PMLA, vol. 128, no. 1, Jan. 2013, pp. 193-200.

Note that the locations of author name and page help clarify which of the language and ideas belong to that particular author and source. The author's idea from that page is understood to end at the parenthetical page number.

When you include a citation, you must also include a full bibliographic entry in your Works Cited list.

*Examples excerpted from: Modern Language Association. MLA Handbook. 9th ed. New York: Modern Language Assoc. of America, 2021.

Paraphrasing  or summarizing an author's ideas in your own words is fine as long as you acknowledge the author. Paraphrasing is a near 1:1 rephrasing, so you need a page number. Summarizing condenses either a full work or a large part of it into a brief version, so no page number is necessary.

1. Paraphrase (following a quote):

According to Gao Xingjian, "Literature is essence divorced from utility" (7). Gao adds, however, than the market for publishing works is constricted by politics (13).

Gao Xingjian. Aesthetics and Creation . Cambria Press, 2012.

2. Summary (with in-text citation):

Naomi Baron broke new ground on the subject.

3. Summary (with parenthetical citation):

At least one researcher has broken new ground on the subject (Baron) .

Baron, Naomi S. "Redefining Reading: The Impact of Digital Communication Media." PMLA , vol. 128, no. 1, Jan. 2013, pp. 193-200.

Note that all of these examples would require a full bibliographic entry of the author's work on your works cited page.

*Examples excerpted from: Modern Language Association.  MLA Handbook.  9th ed. New York: Modern Language Assoc. of America, 2021.

Sometimes you may need to use information cited in another source . For example, a text by Boswell that you found quotes something written by Johnson. There are two possible ways of handling it. You can:

• Find the original item by Johnson and cite directly from that author ( preferred ).
• Name Johnson as a source in your paraphrase, but only cite Boswell in the references page ( Acceptable if the original item would be prohibitively difficult to find; obviously that criteria depends on the situation and your professor's judgment. Ask them. )

Quoted in ("qtd. in"):

Samuel Johnson admitted that Edmund Burke was an "extraordinary man" (qtd. in Boswell 289) .

Boswell, James. Boswell's Life of Johnson . Edited by Augustine Birrell, vol. 3, Times Book Club, 1912. HathiTrust Digital Library , hdl.handle.net/2027/uc1.b3123590.

Noted in Text:

In a speech urging listeners to reject physical destruction and to seek mutual undertanding, Robert F. Kennedy quoted Aeschylus: "In our sleep, pain which cannot foreget falls drop by drop upon the heart until, in our own despair, against our will, comes wisdom through the awful grace of God."

Kennedy, Robert F. "Statement on Assassination of Martin Luther King, Jr., Indianapolis, Indiana, April 4, 1968." John F. Kennedy Presidential Library and Museum , www.jfklibrary.org.

Note that in works cited for both examples, you would only need to list the work(s) you actually read: in other words, Boswell or Kennedy, not Johnson or Aeschylus.

• If there is no author listed, look for other authorship information, such as the creator or editor, or performer of the item, or organization responsible for the site. If there is none of those, or if the organization would also be the publisher, use a short-form version of the full title in quotation marks in place of the author's name in the citation.
• Page numbers are very uncommon on websites, so MLA does not require a page number.

Clear Author (NY Times online article):

"Small changes in your eating habits can lower your risk for many of the diseases associated with aging" (Parker-Pope) , so it's never too early to evaluate your diet. *

Parker-Pope, Tara. "How to Age Well." The New York Times , 2 Nov. 2017, www.nytimes.com/guides/well/how-to-age-well. *

Unclear Author

The female bhakti poets "faced overwhelming challenges through their rejection of societal norms and values" ("Bhakti Poets") . *

"Bhakti Poets: Introduction." Women in World History , Center for History and New Media, chnm.gmu.edu/wwh/modules/lesson1/lesson1.php?s=0. Accessed 20 Sept. 2020. *

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Home / Guides / Citation Guides / MLA Format / MLA Journal Article Citation

How to Cite a Journal Article in MLA

This page is a how-to guide for using scholarly journals as sources and citing them correctly in your papers. Academic journals publish scholarly, peer-reviewed articles written by experts in a specific field. This guide will help you understand what journals are and why they are valuable for your research.

Quickly cite a journal article by using our online form here .

Citing a journal article in mla:, the importance of peer-reviewed academic journals, how journals are organized, where to find journal articles.

• In-text citations
• Works cited references
• Citation with one author
• Citation with two authors
• Citation with three or more authors
• Citation with no known author
• Citation Structures and Examples: Web
• Citation Structures and Examples: Print

Our guide will show you how to cite the journal article both in the text and in the Works Cited page following the guidelines of the Modern Language Association Handbook, 9th Edition.

What is an Academic Journal?

Academic or scholarly journals are periodicals published by universities and other research organizations to present the findings of original research conducted in a particular field. These journals contain highly specific knowledge and are written by experts in that field.

Journals are different from other periodicals such as newspapers or magazines, which cover a broad range of topics and are written in easy to read prose.

Because  journals are written by experts for other experts, they can be difficult to read. The writers often use jargon and other complex language that students may not understand. But that doesn’t mean you should not use journals in your research. Journals are where the most recent research is published and provide in-depth information on a topic.

Tip : Reading the abstract and the conclusion first may help you to understand the article as you read.

Journals are good sources for academic research not only because they are written by experts, but because most (but not all) are also reviewed by other experts before the article is published.

Journals that are peer-reviewed have a board of experts in the field that review articles submitted to the journal. The peer reviewers scrutinize every article closely to validate its findings and ensure that the research was done properly. The process of peer review gives credibility to the journal because it means that every article published has been approved by other experts in the field.

Academic journals are organized in volumes and issues.

• Volume: The volume is all of the editions of the journal published in a calendar year.
• Issue(s):   The issues are all the specific editions of the journal published in that year.

Tip : Journals frequently publish issues around a certain theme, so all of the articles in that issue will relate to a certain topic. This means that there may be other articles in a particular issue that you can use for your research. It pays to check the table of contents for the issue when you find an article that fits your needs.

You will need to include the volume and the issue numbers, and the page numbers in your citations so make sure to write those down when you take notes from a journal.

When you are doing scholarly research, you can’t use popular search engines like Google, Bing, or Yahoo. These will lead you to popular sources that may not work for a school paper. You need to search for information using an academic database which will lead you to scholarly articles.

Databases are organized computer-based collections of data that allow researchers to find a large number of articles quickly and easily.

Examples of popular general academic databases include:

• Academic Search Premier
• Google Scholar

Examples of popular academic databases focused on specific subjects:

• MEDLINE, PubMed Central — focus on biomedical and life sciences
• Lexis Web — focus on legal information
• Education Resources Information Center (ERIC) — focus on education

Many of these databases charge fees for use. The good news? Many can be accessed through a school or university library. Check your library’s website to see what databases it subscribes to and how you can access them.

Using a Journal Article in a Paper

You can use information from your research in three ways:

• Paraphrase: Take the information from a specific paragraph or section of the article and rewrite it in your own words.
• Summarize: Write a broad overview of the section or the article in your own words.
• Quote: Repeat the exact words used by the author using quotation marks.

Whenever you quote, paraphrase, or summarize information in your paper, you need to follow that information with an in-text citation and create a corresponding reference for the source (in the Works Cited).

Journal Article In-text Citations

Citations within your text are important. Each in-text citation:

• Alerts your reader that you are using information from an outside source.
• Usually appears in parentheses at the end of a sentence.
• Is short and only has enough information to help the reader find the complete reference listed in the Works Cited page at the end of the paper.

A MLA style in-text citation has two parts (MLA Handbook 227-228):

• If there is no author listed, include a shortened version of the title
• While many online sources do not have a page number, academic journals almost always do, even when they are available online.

In most cases, the in-text citation is at the end of the sentence in parentheses. If you use the author’s name in the text, you don’t have to repeat it in the parenthesis at the end. Do not separate the author’s name and the page number with a comma. See below for examples.

Works Cited References for Journal Articles

A Works Cited page is included at the end of your paper. It lists full references/citations for all of the sources mentioned in your paper via your in-text citations.

MLA Containers

In the 9th edition of the official Handbook, MLA includes a new term for citing references, which was first introduced in the 8th edition — containers (134). Periodicals like journals are considered “containers” because they contain the articles that are part of a larger whole.

The container holds the source article and is crucial in identifying the source. The title of the first container, the journal name, is printed in italics and follows the article name. When accessing journals through a database, the database is considered the second container. This title is also printed in italics.

Digital Object Identifier (DOI)

Another feature in citing sources is the DOI (Handbook 188) . DOI stands for Digital Object Identifier, which is used to permanently identify an article or document and link to it on the web.

Although a website or database may change names, the DOI will not change and will help your readers locate the document from your citation. Whenever possible, list the DOI in place of the URL. When you have a DOI, you do not need to give the URL of the website. Indicate that a reference is a DOI by adding “https://doi.org/” before the DOI number of your source.

Another way to identify an online location is with a permalink. Permalinks are URLs that are identified as a stable link that the publisher promises not to change.

For journal references, the following elements need to be included in your Work(s) Cited entries: 

• The name of the author or authors. Since journal articles often have more than one author, it is helpful to know when to use et al. in MLA .
• Title of article
• Title of journal (the container)
• Volume and issue number
• Date of publication
• Page numbers
• Database (the 2nd container)
• DOI, permalink, or URL
• Date of access (supplemental, but should be included if the information has no publication date listed)

Citing a Journal Article in MLA (found in databases)

The following are examples of how to cite a journal in MLA 9, both in text and as a full reference in the Works Cited. These were all found via a database.

Note that “Date Accessed” is the day that the journal article was found and read. This information is supplemental and does not always need to be included.

Journal Article Citation With One Author

Cite your source

Journal Article Citation With Two Authors

*Note:  When a source has multiple authors, you should always list them in your citation in the same order they are listed in the source.

Journal Article Citation With Three or More Authors

Journal article citation with no known author, citing a journal article in mla (print).

Citing a journal from a print source requires less information than an online source. For a print source, you need the following information:

• The name of the author or authors for articles with one or two authors. For articles with three or more authors, only the first author’s name is used followed by et al.
• The name of the article in quotation marks
• The name of the journal in italics
• The volume and issue numbers of the journal
• The year of publication
• The page number(s)

View Screenshot | Cite your source

Citing an Online Journal Article (not found using a database)

Some journal articles are accessible online without the use of a database. Citing an online journal article not found in a database requires that you cite the website that you used to access the article as the second container. Do not include the https:// in the web address.

*Note : Since journals are usually stable and credible sources, including an access date is supplemental and not required (“When Should I Include an Access Date for an Online Work”).

• Works Cited

MLA Handbook . 9th ed., Modern Language Association of America, 2021.  

“When should I include an access date for an online work?” MLA Style Center , Modern Language Association, 29 Dec. 2016, style.mla.org/access-dates/.

Published October 31, 2011. Updated June 6, 2021.

Written by Catherine Sigler. Catherine has a Ph.D. in English Education and has taught college-level writing for 15 years.

MLA Formatting Guide

MLA Formatting

• Annotated Bibliography
• Bibliography
• Block Quotes
• et al Usage
• In-text Citations
• Paraphrasing
• Page Numbers
• Sample Paper
• MLA 8 Updates
• MLA 9 Updates
• View MLA Guide

Citation Examples

• Book Chapter
• Journal Article
• Magazine Article
• Newspaper Article
• Website (no author)
• View all MLA Examples

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It’s 100% free to create MLA citations. The EasyBib Citation Generator also supports 7,000+ other citation styles. These other styles—including APA, Chicago, and Harvard—are accessible for anyone with an EasyBib Plus subscription.

No matter what citation style you’re using (APA, MLA, Chicago, etc.) the EasyBib Citation Generator can help you create the right bibliography quickly.

Yes, there’s an option to download source citations as a Word Doc or a Google Doc. You may also copy citations from the EasyBib Citation Generator and paste them into your paper.

Creating an account is not a requirement for generating MLA citations. However, registering for an EasyBib account is free and an account is how you can save all the citation you create. This can help make it easier to manage your citations and bibliographies.

Yes! Whether you’d like to learn how to construct citations on your own, our Autocite tool isn’t able to gather the metadata you need, or anything in between, manual citations are always an option. Click here for directions on using creating manual citations.

If any important information is missing (e.g., author’s name, title, publishing date, URL, etc.), first see if you can find it in the source yourself. If you cannot, leave the information blank and continue creating your citation.

It supports MLA, APA, Chicago, Harvard, and over 7,000 total citation styles.

To cite a magazine with multiple authors and no page numbers in MLA style, you need to have basic information including the authors, the article’s title, the magazine’s title, the publication date, and the DOI, permalink, or URL. The templates and examples for in-text citations and a works-cited-list entry of a book written by multiple authors are given below:

In-text citation template and example:

For citations in prose, use the first name and surname of the first author followed by “and others” or “and colleagues” for sources with three or more authors. In subsequent citations, use only the surname of the first author followed by “and others” or “and colleagues.” In parenthetical citations, always use only the surname of the first author followed by “et al.”

Citation in prose:

First mention: Han Ong and colleagues…. or Han Ong and others ….

Subsequent occurrences: Ong and colleagues…. or Ong and others ….

Parenthetical:

….( Ong et al.).

Works-cited-list entry template and example:

The title of the article is in plain text and title case; it is placed inside double quotation marks. The title of the magazine is set in italics and title case. Follow the format given in the template and example for setting the day, month, and year.

Surname, First., et al. “Title of the Article.” Title of the Magazine , Publication Date, DOI/permalink/URL.

Ong, Han, et al. “The Monkey Who Speaks.” The New Yorker , 13 Sept. 2021, www.newyorker.com/magazine/2021/09/13/the-monkey-who-speaks.

Use only the first author’s name in surname–first name order in the entry followed by “et al.”

To cite an online journal or magazine article in MLA style, you need to have basic information including the author, the article’s title, the journal or magazine’s title, the publication date, and the DOI, permalink, or URL. If available, also include a volume and an issue number of the journal or magazine. The templates for in-text citations and a works-cited-list entry of an online journal article and examples are given below for a source with one author:

For citations in prose, use the first name and surname of the author on the first occurrence. In subsequent citations, use only the surname. In parenthetical citations, always use only the surname of the author.

First mention: Elizabeth Garber ….

Subsequent occurrences: Garber ….

….(Garber).

The title of the journal or magazine article is set in plain roman text and title case; it is placed inside double quotation marks. The title of the journal or magazine is set in italics and title case. Follow the format given in the template and example for writing the publication month or season and year.

Surname, First. “Title of the Article.” Journal or Magazine Title , Volume, Issue, Publication Date, DOI/permalink/URL.

Garber, Elizabeth. “Craft as Activism.” The Journal of Social Theory in Art Education , vol. 33, no.1, spring 2013, www.scholarscompass.vcu.edu/jstae/vol33/iss1/6/ .

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Pasco-Hernando State College

• MLA In-Text Citations
• Finding and Evaluating Sources (Critical Analysis)
• Synthesizing Information from Sources
• MLA Page Format
• MLA Works Cited
• APA Documentation
• Writing a Research Paper

Test Yourself

• MLA - Part A - Quiz
• MLA - Part B Quiz
• MLA Handout
• MLA Quick Citations

How to cite sources

One or two authors:.

See information below about using a page number. Sometimes, there is no page number to use.

Use the last name of the author and the page number. Note that there is nothing between the last name and page number.

(Anderson 50) 

If there are two authors, use both last names even if both authors have the same last name.

(Sampson and Bernini)  - Note that the word and is used and not an ampersand (&).

When there are two authors, note that even though both names are used to cite the source, it is still one source and should have a singular verb when used in a signal phrase: Sampson and Bernini says, not say. (The source - it - says.)

More than two people named as authors

Alvarez et al. (et al. is the Latin abbreviation for and others .). When more than two, individual names many not be listed even in the Works Cited. There is no longer a choice to list all the authors.

More than one source written by the same author

When you have more than one source from the same author, you must distinguish between them in the citation by adding the title: (Mirando, “Dinosaurs”) and (Mirando, “Jurassic Wilderness”).

If you name the author in the sentence, just put the title in parentheses in quotation marks:

According to Mirando, there are multiple theories for the extinction of the dinosaurs (“Dinosaurs”).

Different authors with the same last name

If you find two sources where the authors, have the same last name, obviously, using only the last name to cite the source will not clearly identify the source. In this case, use the first name as well:  (Gonzalez, Jorge) or (Gonzalez, Marisol).

When no person named as author

Sometimes, a source has no person named as author. This is actually common in articles in encyclopedias and even newspapers, newswires, or news services such as The Associated Press. In that case, just use the title of the article or page,  not  the publication or website.

Occasionally, an organization or group is listed as the author: Mayo Clinic Staff.  Then, the author is considered to be Mayo Clinic Staff. However, this applies only when a group or organization is actually listed as author. There are some special rule with government publications, but generally, the format applies. Start with the title of the publication when no specific agency is named as author. The agency will be listed as publisher.

Here is an example of using a title:

("Dinosaur Extinction")

Articles are considered short, published works, so titles of articles or pages from a website must be in quotation marks.

If the title to an article is longer than three or four words, shorten (don't use a key word or words) the title to the first noun. “Crime: Risks for Children of Non-Biological Parents Greater” should be shortened to “Crime.” “Organic Foods: Are They Really Healthier?” should be shortened to “Organic Foods” since  Foods  is the first noun . ( Note that the question mark is dropped on a shortened title.) An article with no author which is entitled "What Is Gene Therapy?" should be cited as "What Is Gene Therapy?" since it is not longer than three or four words, and the word therapy is the first noun anyway. The question mark is kept since the title is not shortened.) By retraining the first word(s), the reader can look alphabetically to the Works Cited list and easily find the source.

Don't forget to drop any period or comma that would ordinarily be next to a question mark or exclamation point. An example of dropping the comma is as follows:  According to "What Is Gene Therapy?" there are several approaches.  Ordinarily, there would be a comma after the introductory wording According to "What Is Gene Therapy?"  However, since the grammar rule is to drop any comma or period next to a question mark or exclamation point, it would be dropped.

Also, the first letter of the first word and all other words in titles has to be capitalized in MLA style even if they are not so in the article itself except the following:

• articles (a, an, the),
• BOYFANS (but, or, yet, for, and, nor, so) – coordinating conjunctions, and
• prepositions (such as in, at, of, around, over, and so on).

Here’s an example of a title with words that should not start with a capital: “Genetic Manipulation of Food Has Some Scientists in the United States Worried”

Many sources are not in MLA style, so the titles are not following MLA format. Using capitals which are not capitals in the original is not a violation of the rule that you can’t change what’s in a quote. Using quotation marks for titles of short, published works is a different use of quotation marks than for quotes. (By the way, you can change a quote in quotation marks by putting brackets [   ] around your changes as previously mentioned.)

All caps are not used in MLA style except for some abbreviations such as NATO or AIDS.  When there are all caps in a title, change to upper and lower case as otherwise appropriate

When you are using a specific article or page in a website, your source is the specific article or page and not the website. 

If an article or page is in a website or newspaper and there is no author specifically named, use the title of the article or page as further described. The title of a source in a dictionary, encyclopedia, or other reference book  is the word you are looking up. For example, if you are looking up the word  sunspots,  the title of the article is “sunspots” or “Sunspots,” however it is written in the source.

Here is an example of how to use the title to cite the source:

“The most accepted theory of dinosaur extinction is that a comet or asteroid hit the earth causing megatons of debris into the air blocking the sunlight” (“Dinosaur Extinction” 587).

The reference to the source could be in the sentence:

“Dinosaur Extinction” explains that “[t]he most accepted theory of dinosaur extinction is that a comet or asteroid hit the earth causing megatons of debris into the air blocking the sunlight” (587).

Punctuation and Quotes

Signal phrases (words that say who says the quote) with full sentence quotes.

There is no rule to use a comma to put a comma before or after words that are in quotation marks. Quoted words must follow the same rules for punctuation as words that are not in quotation marks. The only special rule there is to separate a signal phrase from a sentence quote with a comma.

Signal phrases are phrases that identify the source of a full sentence quote.

According to Anderson, “While tattoos may be popular today, few realize that tattooing was also popular in some ancient societies” (50).

The words  According to Anderson  are a signal phrase.  Hernandez says, Khan states, and Dubrovsky agrees are all examples of signal phrases. 

Note that there is a comma separating the signal phrase from the sentence quote and that the first letter of the first word of the quote starts with a capital since it is a sentence. 

The signal phrase could be at the end of the sentence.

“While tattoos may be popular today, few realize that tattooing was also popular in some ancient societies,” according to Anderson (50).

See how there is still a comma to separate the signal phrase from the sentence quote.

Note that the comma goes before and not after the end quotation mark.

Also, see how the period follows the parentheses and does not go before the parentheses. Parenthetical documentation is part of the sentence.

The signal phrase could be in the middle of the sentence.

“While tattoos may be popular today,” according to Anderson, “few realize that tattooing was also popular in some ancient societies” (50).

Signal phrases  are limited  to words that identify the source of the quote such as the following: Jones says, According to Chan, “Dinosaur Extinction” claims.

The addition of other words such as the word  that  changes a signal phrase to just the beginning of a sentence that happens to contain some quoted words (even thought they might be a sentence) so what is in the quotation marks is a continuation of the sentence and is not considered a separate sentence.  In these cases, there should not be a comma, and the first letter of the quote should not be capitalized since it is not considered to be the first word in a sentence. Here is an example:

Anderson says that “[w]hile tattoos may be popular today, few realize that tattooing was also popular in some ancient societies” (50). 

Note that the re is no comma and no capital when the word  that  is used.

Partial sentence quotes; distinguishing a signal phrase

Sometimes a sentence includes words that identify the source or quoted words, but the quote is not a complete sentence. This is a partial sentence quote, and the words that identify the source are not considered a signal phrase to be separated by a comma. They are just part of a sentence that happens to begin outside the quote.

Anderson says that tattoos have been used "for thousands of years."

Remember that a signal phrase tells the source of a sentence quote. If there is not sentence quote, there is no signal phrase. Without a sentence quote, the words Anderson says (and other signal phrases wording) are just part of the sentence. 

Anderson says that the interest in tattoos in the West has never been so popular. 

See how there is no comma and no capital. The words Anderson says are the subject and verb of the sentence. Also see that the word that is used and not just Anderson says the interest....

More than one source with the same title and no person named as author

If you have more than one source with the same title, put the name of the publication in italics separated by a comma after the title of the article: “Farmed Salmon,”  Aquaculture Journal  and “Farmed Salmon,”  Washington State Journal.  The idea is to be sure they are distinguished from one another.

It is preferable not to include the word that  after a signal phrase which introduces a sentence quote.

When the same information comes from more than one source

Sometimes, the same information is in more than one of your sources. If you are paraphrasing instead of quoting, just identify both sources separated by a semicolon in one parentheses: (“Dinosaur Extinction”; Jones).

(Note that the semicolon is placed after the end quotation mark whereas periods and commas are placed before the end quotation mark when there is supposed to be a period or comma next to an end quotation mark.)

Quoting a quote from a source (indirect quotations)

Sometimes, other people are quoted in your source. This is called an  indirect quotation . When we use a quote that is quoted in the source, use the abbreviation  qtd. in  to let the reader know which source the quote you are quoting comes from. Say, for example, Jones wrote the article you found, but she quotes Herman Smith, and you want to use what Herman Smith says.

Say this is the wording in the source:  Jones gives information provided by Professor Herman Smith.  Smith says, "There are more dangers in the depth of the oceans that we know about."

Here’s a couple of ways to cite that information.

According to Smith, “There are more dangers in the depths of the oceans that we know about” (qtd. in Jones). This abbreviation qtd. in means that this quote is quoted in the article written by Jones. See how only Smith's words are actually quoted, so the quotation marks go around those words. 

Here is another way Smith's words can be quoted.

"Smith says, 'There are more dangers in the depths of the oceans that we know about'" (qtd. in Jones). 

In this phrasing, since the entire sentence is quoted, there is a quote within a quote.  Single quotation marks must be used when you have to use quotation marks inside quotation marks.  Note that there regular double quotation marks around all of the exact words from the source and single quotation marks around the exact words from Smith.

“There are more dangers in the depths of the oceans that we know about” (Herman Smith, qtd. in Jones). Here, the person who is quoted is named in the citation instead of in the sentence.

Including the name of the person being quoted is not required:

“There are more dangers in the depths of the oceans that we know about” (qtd. in Jones).

It is optional to include the name of the person quoted in the source in parentheses. If the name of the person quoted is used in the parentheses, then it should be the full name.

Use of the words  qtd . in only applies when someone else is quoted in the source.

If there is no person named as author, use the title of the article or page to refer to the source. When you are using a specific article or page from a website, your source is the specific article or page and not the website. It’s like finding an article in a newspaper. Your source is the article, not the newspaper.

According to Smith, “Some earthquakes are caused by methane gas explosions” (qtd. in “Underwater Dangers”).

“Some earthquakes are caused by methane gas explosions” (Smith, qtd. in “Underwater Dangers”).

The reader has to be told which source your quote is coming from.

Length of quotations

Even though there is a sentence quote for these examples, sometimes more than one sentence is quoted. The method of documenting is still the same.

If, however, the quote is more than four lines from the source, you must indent the quote ten spaces (1”) from the left-hand margin. In this situation, quotation marks are not used, and the period goes before the parentheses. Here are more than four lines (not sentences) from a source:

“The theory that dinosaurs became extinct as a result of climate changes from a huge meteor impact has far reaching implications. There is always the possibility such an impact will happen again. There are many meteors that come close to earth’s gravitational pull. Scientists closely watch to identify potential problems. There is some discussion about an organized effort to launch a missile to either explode such meteors or defect them away from our orbit” (Jones).

Here is the quote indented ten spaces (1”) from the left margin:

The theory that dinosaurs became extinct as a result of climate changes from a huge meteor impact has far reaching implications. There is always the possibility such an impact will happen again. There are many meteors that come close to earth’s gravitational pull. Scientists closely watch to identify potential problems. There is some discussion about an organized effort to launch a missile to either explode such meteors or defect them away from our orbit.  (Jones)

Paraphrasing and summarizing requires citations

Quoting is only one way of bringing information into a paper from a source. You can also paraphrase or summarize which is to put the source’s ideas into your own words. Quotation marks are not used, but you still have to give credit to the source the same way as with quotes. It is still plagiarism if you don’t use MLA or other documentation for paraphrased information. Each and every sentence with information from a source – whether you quote or paraphrase – must cite the source.

Use of Ellipsis (…) to show omitted words or sentences from a quote

You may remember seeing a series of three periods … in a quote. This is called an ellipsis and is used to represent an omission. Even though you may omit something from the beginning of a sentence you quote from, the general rule is not to use an ellipsis at the beginning of a quote. They are generally used in the middle of a quote to take out unnecessary words in a sentence or between sentences which are being quoted. You may use an ellipsis at the end of a quote if you don’t complete a sentence.

You may also use an ellipsis between quoted sentences to indicate that a sentence or sentences were omitted.

Identifying Internet sources

Increasingly, the Internet is being used for research. Because everything looks the same on the screen, it is important to figure out what exactly you are looking at. Sometimes, you are using information from a website that only has a couple of pages with no named author and which are clearly written for that website. In that case, your source is the website. Nowadays, these limited websites are not very common. Remember that the point of a citation system is to tell the reader where you found the information so that the reader can access the source.  In a website that has more than a couple of pages, the reader would have difficulty finding the information.

When you are using an article or articles posted to a website or a specific page or pages in a website, your source is the particular article(s) or pages(s) just like an article in a newspaper and not the website. If there is a separate author, refer to the source by the author’s last name, just as with any other source. If there is no named author, refer to the source by the title of the article or page in quotation marks. 

Page Numbers: When and how to use; When you don’t know the actual page number

The requirement to use a page number in MLA style refers to the actual page number in the original hard copy publication. The rule to use a page number does not apply to poetry or plays. See section below for details.

Sources created only for an online presentation do not have the type of page numbers to which the rule to use page numbers applies even when we have to click through a sequence of “pages.” The reason we should not use these website page numbers is that the pagination does not necessarily appear the same on everyone’s computer. What one person sees as page two could be page three on someone else’s computer.

When an article that was originally printed in a hard copy publication is posted, usually, there is no page number since it is an html format. If it is uploaded as a .pdf, the page number will appear.

When we don’t know the page number the particular information was printed on in the original hard copy publication, don’t use a page number.

If an Internet source numbers the paragraphs, you can use the paragraph number. However, if not numbered already in the web page, you should not start counting paragraphs to use a paragraph number.

The custom is that if you know a page number, you should not repeat the author’s name if you are using information from the same source in the same paragraph unless you use information from another source in between since you could just use the page number. However, if you don’t have a page number to use, you’ll have to repeat the author’s last name or title of the article (not the publication the article was printed in) for all references to that particular source.

When you have several sentences with information from a source, you should vary how you refer to the source: According to Jones, “Sasquatch is absolutely a real creature.” She goes on to say that they are intelligent enough to have hidden from humans. “The reason no skeletal remains have been found is that Sasquatch bury their dead” (Jones).

Since sometimes there is no page number or paragraph number to reference, you might not have a parentheses at all if the source is referred to as part of the sentence. The Internet has created situations where we don’t use parentheses even though MLA is called a parenthetical documentation system.

No Page Numbers: Poems and Plays

The MLA rule to use a page number for sources that were originally published in hard copy and for which we know the exact page number does not apply to poems.

In citing poetry, line numbers are used instead: (“Fire and Ice” 1). If the name of the poem is already mentioned in the sentence or it is clear that this quote is from this poem, use just the line number: (1).

When quoting two lines of poetry (not sentences), use a slash between the lines: “Some say the world will end in fire/Some say in ice” (1-2).

When quoting more than two lines, indent one inch from the left, write the lines as they appear in the poem (one under the other), do not use quotation marks, and the period goes before the parenthetical documentation:

Some say the world will end in fire

Some say in ice.

From what I’ve tasted of desire

I hold with those who favor fire.  (“Fire and Ice” 1-4)

If the title is mentioned previously and it is clear the quote is from this poem, use just the line numbers.

If the poem is divided into sections such as chapters or parts, then identify in the citation: ( Odyssey  2.6) represent chapter or book 2, line 6.

The MLA rule to use a page number for sources that were originally published in hard copy and for which we know the exact page number does not apply to plays.

Cite the act , scene, and line number is used:  Macbeth  2.1.13 referring to act. scene.line.

If lines from more than character are quoted, indent 10 spaced (1″) from the left starting a new line for each character, and indicate the character:

Mrs. Hale:  ( stiffly ) There’s a great deal of work to be done on a farm.

County Attorney:  To be sure. And yet ( with a little bow to her ) I know there

     are some Dickson County farmhouses which do not have such roller towels.

Mrs. Hale:  Those towels get dirty awful quick.  Men’s hand aren’t always as

     clear as they might be.  ( Trifles  32-34)

Note that since this is a one-act play, only the line numbers are used.

Here is a quote from a play that has acts and scenes:

Hamlet:  Methinks it is like a weasel.

Polonius:  It is back’d like a weasel.

Hamlet:  Or like a whale.  ( Ham . 5.2.330-33)

Important Details:

• Use last name only when there is a person or persons listed as author(s) - no first name or p., pg., or other reference to the word page.
• Don't use the words source, article, or any other words to refer to a source other than the last name or the title of the article when no person listed as source.
• The page number refers to the page number the specific information was printed on in the original publication, not a page number assigned in a website. When the page number is not known, you just don’t list a page number. Sources posted to the Internet from a hard copy or pages on an web only site will not have a page number as part of the citation.
• The end quotation mark goes after the words quoted, not the parentheses. The parenthetical documentation is part of the sentence, but it is not part of the quote.
• There is no comma or period before the parentheses except for the end quotation mark. An exclamation point or question mark which is part of the quote is used.
• If you name the source in the sentence, you should not put the name in the parentheses. 
• The source must be named in each and every sentence with information from a source whether you use exact words or put the information into your own words. If you don't, it is plagiarism. It is not all right to have more than one sentence from a source and then cite the source.The reader had no way of knowing how many, if any at all, of the previous sentences are from the source.
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The complete guide to mla & citations, what you’ll find in this guide.

This page provides an in-depth overview of MLA format. It includes information related to MLA citations, plagiarism, proper formatting for in-text and regular citations, and examples of citations for many different types of sources.

Looking for APA? Check out the Citation Machine’s guide on APA format . We also have resources for Chicago citation style as well.

How to be a responsible researcher or scholar

Putting together a research project involves searching for information, disseminating and analyzing information, collecting information, and repurposing information. Being a responsible researcher requires keeping track of the sources that were used to help develop your research project, sharing the information you borrowed in an ethical way, and giving credit to the authors of the sources you used. Doing all of these things prevents plagiarism.

What is Plagiarism?

Plagiarism is the act of using others’ information without giving credit or acknowledging them. There are many examples of plagiarism. Completely copying another individual’s work without providing credit to the original author is a very blatant example of plagiarism. Plagiarism also occurs when another individual’s idea or concept is passed off as your own. Changing or modifying quotes, text, or any work of another individual is also plagiarism. Believe it or not, you can even plagiarize yourself! Reusing a project or paper from another class or time and saying that it’s new is plagiarism. One way to prevent plagiarism is to add citations in your project where appropriate.

What is a Citation?

A citation shows the reader of your project where you found your information. Citations are included in the body of a project when you add a quote to your project. Citations are also included in the body when you’re paraphrasing another individual’s information. These citations in the body of a research paper are called in-text citations. They are found directly next to the information that was borrowed and are very brief to avoid causing distraction while reading a project. These brief citations include the last name of the author and a page number. Scroll down for an in-depth explanation and examples of MLA in-text citations.

In-text citations provide us with a brief idea as to where you found your information, though they usually don't include the title and other components. Look on the last page of a research project to find complete citations.

Complete citations are found on what MLA calls a works-cited list, which is sometimes called an MLA bibliography. All sources that were used to develop a research project are found on the works-cited list. Complete citations are also created for any quotes or paraphrased information used in the text. Complete citations include the author’s name, the title, publisher, year published, page numbers, URLs, and a few other pieces of information.

Looking to create your citations in just a few clicks? Need an MLA format website or book citation? Visit Citation Machine.net! Our Citation Machine MLA generator, which is an MLA citation website, will create all of your citations in just a few clicks. Click here to see more styles .

Why Does it Matter?

Citing your sources is an extremely important component of your research project. It shows that you’re a responsible researcher and that you located appropriate and reputable sources that support your thesis or claim. In addition, if your work ends up being posted online or in print, there is a chance that others will use your research project in their own work!

Scroll down to find directions on how to create citations.

How the Modern Language Association Helps You Become a Responsible Researcher

What is mla format.

The Modern Language Association is an organization that was created to develop guidelines on everything language and literature related. They have guidelines on proper grammar usage and research paper layouts. In addition, they have English and foreign language committees, numerous books and journal publications, and an annual conference. They are not connected with this guide, but the information here reflects the association’s rules for formatting papers and citations.

What are citations?

The Modern Language Association is responsible for creating standards and guidelines on how to properly cite sources to prevent plagiarism. Their style is most often used when writing papers and citing sources in the liberal arts and humanities fields. “Liberal arts” is a broad term used to describe a range of subjects including the humanities, formal sciences such as mathematics and statistics, natural sciences such as biology and astronomy, and social sciences such as geography, economics, history, and others. The humanities focuses specifically on subjects related to languages, art, philosophy, religion, music, theater, literature, and ethics.

Believe it or not, there are thousands of other types of citation styles. While this citation style is most often used for the liberal arts and humanities fields, many other subjects, professors, and schools prefer citations and papers to be styled in MLA format.

What’s the difference between a bibliography and a works-cited list?

Great question. The two terms cause a lot of confusion and are consistently misused not only by students but educators as well! Let’s start with what the two words mean.

A bibliography displays the sources the writer used to gain background knowledge on the topic and also research it in-depth. Before starting a research project, you might read up on the topic in websites, books, and other sources. You might even dive a bit deeper to find more information elsewhere. All of these sources you used to help you learn about the topic would go in an MLA format bibliography. You might even include other sources that relate to the topic.

A works-cited list displays all of the sources that were mentioned in the writing of the actual paper or project. If a quote was taken from a source and placed into a research paper, then the full citation goes on the works-cited list.

Both the works-cited list and bibliography go at the end of a paper. Most teachers do not expect students to hand in both a bibliography AND a works-cited list. Teachers generally expect to see a works-cited list, but sometimes erroneously call it a bibliography. If you’re not sure what your teacher expects, a page in MLA bibliography format, a works-cited list, or both, ask for guidance.

Why do we use this MLA style?

These specific guidelines and standards for creating citations were developed for numerous reasons. When scholars and researchers in literature, language, and numerous other fields all cite their sources in the same manner, it makes it easier for readers to look at a citation and understand the different components of a source. By looking at an MLA citation, we can see who the author is, the title of the source, when it was published, and other identifiable pieces of information.

Imagine how difficult it would be to understand the various components of a source if we didn’t all follow the same guidelines! Not only would it make it difficult to understand the source that was used, but it would also make it difficult for readers to locate it themselves. This streamlined process aides us in understanding a researcher’s sources.

How is the new version different than previous versions?

This citation style has changed dramatically over the past couple of years. The MLA Handbook is currently in its 9th edition.

The new version expands upon standards previously set in the 8th edition of the MLA Handbook, including the core elements. The structure of citations remains the same, but some formatting guidance and terminology have changed.

• DOI numbers are now formatted as https://doi.org/xx.xxxx/xxx.xxxx.xxxx
• Seasons in publishing daters are lowercased: spring 2020
• The term “optional elements” is now “supplemental elements”
• “Narrative in-text citations” are called “citations in prose”

In addition, new information was added on the following:

• Hundreds of works-cited-list entries
• MLA formatting for papers
• Punctuation, spelling, and other mechanics of prose
• Chapter on inclusive language
• Notes (bibliographic and content)

For more information on MLA 9, click here .

A Deeper Look at Citations

What do they look like.

There are two types of citations. The first is a full, or complete, citation. These are found at the end of research projects. These citations are usually listed in alphabetical order by the author’s last names and include all of the information necessary for readers to be able to locate the source themselves.

Full citations are generally placed in this MLA citation format:

%%Last name of the author, First name of the author. “Source’s Title.” Container’s Title, roles and names of any other individuals who helped contribute to the source, the version of the source, any numbers associated with the source, the name of the publisher, the date the source was published, the location where individuals can find the source themselves (usually a DOI, URL, or page range).

There are times when additional information is added into the full citation.

Not sure how to transfer the information from your source into your citation? Confused about the term, “containers”? See below for information and complete explanations of each citation component.

The second type of citation, called an “in-text citation,” is included in the main part, or body, of a project when a researcher uses a quote or paraphrases information from another source. See the next section to find out how to create in-text citations.

What are in-text citations?

As stated above, in-text citations are included in the main part of a project when using a quote or paraphrasing a piece of information from another source. We include these types of citations in the body of a project for readers to quickly gain an idea as to where we found the information.

These in-text citations are found directly next to the quote or paraphrased information. They contain a small tidbit of the information found in the regular MLA citation. The regular, or complete, citation is located at the end of a project, on the works-cited list.

Here’s what a typical in-text citation looks like:

In the book The Joy Luck Club, the mother uses a vast amount of Chinese wisdom to explain the world and people’s temperaments. She states, “Each person is made of five elements…. Too much fire and you have a bad temper...too little wood and you bent too quickly...too much water and you flowed in too many directions” (Tan 31).

This specific in text citation, (Tan 31), is called an MLA parenthetical citation because the author’s name is in parentheses. It’s included so the reader sees that we are quoting something from page 31 in Tan’s book. The complete, regular citation isn’t included in the main part of the project because it would be too distracting for the reader. We want the reader to focus on our work and research, not get caught up on our sources.

Here’s another way to cite in the text:

In Tan’s novel The Joy Luck Club, the mother uses a vast amount of Chinese wisdom to explain the world and people’s temperaments. She states, “Each person is made of five elements... Too much fire and you have a bad temper... too little wood and you bent too quickly... too much water and you flowed in too many directions" (31).

If the reader would like to see the source’s full information, and possibly locate the source themselves, they can refer to the last part of the project to find the regular citation.

The regular citation, at the end of the project looks like this:

%%Tan, Amy. The Joy Luck Club. Penguin, 1989, p. 31.

Notice that the first word in the full citation (Tan) matches the “Tan” used in the body of the project. It’s important to have the first word of the full citation match the term used in the text. Why? It allows readers to easily find the full citation on the works-cited list.

If your direct quote or paraphrase comes from a source that does not have page numbers, it is acceptable to place a line number (use line or lines), paragraph number (use the abbreviation par. or pars.), sections (sec. or secs.), or chapters (ch. or chs.). Only use these other terms if they are actually labeled on the source. If it specifically says on the source, “Section 1,” for example, then it is acceptable to use “sec. 1” in the in-text citation.

If there are no numbers to help readers locate the exact point in the source, only include the author’s last name.

To determine how to create in-text citations for more than one author, no authors, or corporate authors, refer to the “Authors” section below.

More about quotations and how to cite a quote:

• Use quotes from outside sources to help illustrate and expand on your own points. The majority of your paper should be your own writing and ideas.
• Include the quote exactly as you found it. It is okay to use only certain words or phrases from the quote, but keep the words (spelling and capitalization) and punctuation the same.
• It is acceptable to break up a direct quote with your own writing.

Example from a movie:

Dorothy stated, "Toto," then looked up and took in her surroundings, "I’ve a feeling we’re not in Kansas anymore" ( Wizard of Oz ).

• The entire paper should be double-spaced, including quotes.
• If the quote is longer than four lines, it is necessary to make a block quote. Block quotes show the reader that they are about to read a lengthy amount of text from another source.
• Start the quote on the next line, half an inch from the left margin.
• Do not use any indents at the beginning of the block quote.
• Only use quotation marks if there are quotation marks present in the source.
• If there is more than one paragraph in the block quote, indent the beginning of the paragraphs after the first one an additional half an inch from the left margin.
• Add your in-text citation after the final period of the block quote. Do not add an additional period after the parenthetical citation.

While his parents sat there in surprise, Colton went onto say:

“Cause I could see you,” Colon said matter-of-factly. “I went up and out of my body and I was looking down and I could see the doctor working on my body. And I saw you and Mommy. You were in a little room by yourself, praying; and Mommy was in a different room, and she was praying and talking on the phone.” (Burpo xxi)

How to create a paraphrase:

As stated above, the majority of your paper should be your own writing and ideas. It’s acceptable to include quotes, but they shouldn’t crowd your paper. If you’re finding that you’re using too many quotes in your paper, consider adding paraphrases. When you reiterate a piece of information from an outside source in your own words, you create a paraphrase.

Here’s an example:

Readers discover in the very first sentence of Peter Pan that he doesn’t grow up (Barrie 1).

What paraphrases are:

• Recycled information in the paper writer’s own words and writing style.
• They’re still references! Include an in-text citation next to the paraphrased information.

What paraphrases are not:

• A copy and pasted sentence with a few words substituted for synonyms.

Confused about whether footnotes and endnotes should be used?

Footnotes and endnotes are completely acceptable to use in this style. Use a footnote or endnote if:

• Adding additional information will help the reader understand the content. This is called a content note .
• You need to cite numerous sources in one small section of your writing. Instead of clogging up a small paragraph with in-text citations (which could cause confusion for the reader), include a footnote or endnote. This is called a bibliographic note .

Keep in mind that whether you choose to include in-text citations or footnotes/endnotes, you need to also include a full reference on the MLA format works-cited list.

Content note example:

Even Maurice Sendak’s work (the mastermind behind Where the Wild Things Are and numerous other popular children’s picture books) can be found on the banned books list. It seems as though nobody is granted immunity. 1

• In the Night Kitchen ’s main character is nude on numerous pages. Problematic for most is not the nudity of the behind, but the frontal nudity.

Work Cited:

%%Sendak, Maurice. In The Night Kitchen. Harper Collins, 1996.

Bibliographic note example:

Dahl had a difficult childhood. Both his father and sister passed away when he was a toddler. He was then sent away by his mother to boarding school (de Castella). 1

• Numerous books, such as Matilda, James and the Giant Peach, and The BFG, all feature characters with absent or difficult parents.

MLA Works Cited:

Include 4 full citations for: de Castella’s article, Matilda, James and the Giant Peach, and The BFG .

Don’t forget to create full, or regular citations, and place them at the end of your project.

If you need help with in-text and parenthetical citations, CitationMachine.net can help. Our MLA citation generator is simple and easy to use!

Common Knowledge: What Is It and How Will It Affect My Writing?

Footnotes, endnotes, references, proper structuring. We know it’s a lot. Thankfully, you don’t have to include a reference for EVERY piece of information you add to your paper. You can forget about including a reference when you share a piece of common knowledge.

Common knowledge is information that most people know. For example, these are a few facts that are considered common knowledge:

• The Statue of Liberty is located in New York City
• Tokyo is the capital of Japan
• Romeo and Juliet is a play written by William Shakespeare
• English is the language most people speak in England
• An elephant is an animal

We could go on and on. When you include common knowledge in your paper, omit a reference. One less thing to worry about, right?

Before you start adding tons of common knowledge occurrences to your paper to ease the burden of creating references, we need to stop you right there. Remember, the goal of a research paper is to develop new information or knowledge. You’re expected to seek out information from outside sources and analyze and distribute the information from those sources to form new ideas. Using only common knowledge facts in your writing involves absolutely zero research. It’s okay to include some common knowledge facts here and there, but do not make it the core of your paper.

If you’re unsure if the fact you’re including is common knowledge or not, it doesn’t hurt to include a reference. There is no such thing as being overly responsible when it comes to writing and citing.

Wikipedia - Yay or Nay?

If you’re wondering whether it’s okay to use Wikipedia in your project, the answer is, it depends.

If Wikipedia is your go-to source for quick information on a topic, you’re not alone. Chances are, it’s one of the first websites to appear on your results page. It’s used by tons of people, it’s easily accessible, and it contains millions of concise articles. So, you’re probably wondering, “What’s the problem?”

The issue with Wikipedia is that it’s a user-generated site, meaning information is constantly added and modified by registered users. Who these users are and their expertise is somewhat of a mystery. The truth is anyone can register on the site and make changes to articles.

Knowing this makes some cringe, especially educators and librarians, since the validity of the information is questionable. However, some people argue that because Wikipedia is a user-generated site, the community of registered users serve as “watchdogs,” ensuring that information is valid. In addition, references are included at the bottom of each article and serve as proof of credibility. Furthermore, Wikipedia lets readers know when there’s a problem with an article. Warnings such as “this article needs clarification,” or “this article needs references to prove its validity” are shared with the reader, thus promoting transparency.

If you choose to reference a Wikipedia article in your research project, and your teacher or professor says it’s okay, then you must reference it in your project. You would treat it just as you would with any other web source.

However, you may want to instead consider locating the original source of the information. This should be fairly easy to do thanks to the references at the bottom of each article.

Specific Components of a Citation

This section explains each individual component of the citation, with examples for each section for full citations and in-text citations.

Name of the author

The author’s name is usually the first item listed in the MLA citation. Author names start with the last name, then a comma is added, and then the author’s first name (and middle name if applicable) is at the end. A period closes this information.

Here are two examples of how an author’s name can be listed in a full citation:

Twain, Mark.

Poe, Edgar Allan.

For in-text:

(Author’s Last name page number) or Author’s Last name... (page).

Wondering how to format the author’s name when there are two authors working jointly on a source? When there are two authors that work together on a source, the author names are placed in the order in which they appear on the source. Place their names in this format:

Author 1’s Last Name, First name, and Author 2’s First Name Last Name.

Here are two examples of how to cite two authors:

Clifton, Mark, and Frank Riley.

Paxton, Roberta J., and Michael Jacob Fox.

(Author 1’s Last name and Author 2’s Last name page number) or Author 1’s Last name and Author 2’s Last name... (page).

There are many times when three or more authors work together on a source. This often happens with journal articles, edited books, and textbooks.

To cite a source with three or more authors, place the information in this format:

Author 1’s Last name, First name, et al.

As you can see, only include the first author’s name. The other authors are accounted for by using “et al.” In Latin, et al. is translated to “and others.” If using the Citation Machine citation generator, this abbreviation is automatically added for you.

Here’s an example of a citation for three or more authors:

%%Warner, Ralph, et al. How to Buy a House in California. Edited by Alayna Schroeder, 12th ed., Nolo, 2009.

(Author 1’s Last name et al. page number)

Is there no author listed on your source? If so, exclude the author’s information from the citation and begin the citation with the title of the source.

For in-text: Use the title of the source in parentheses. Place the title in italics if the source stands alone. Books and films stand alone. If it’s part of a larger whole, such as a chapter in an edited book or an article on a website, place the title in quotation marks without italics.

( Back to the Future )

(“Citing And Writing”)

Other in-text structures:

Authors with the same last name in your paper? MLA essay format requires the use of first initials in-text in this scenario.

Ex: (J. Silver 45)

Are you citing more than one source by the same author? For example, two books by Ernest Hemingway? Include the title in-text.

Example: (Hemingway, For Whom The Bell Tolls 12).

Are you citing a film or song? Include a timestamp in the format of hours:minutes:seconds. ( Back to the Future 00:23:86)

Was the source found on social media, such as a tweet, Reddit, or Instagram post? If this is the case, in an MLA format paper, you are allowed to start the citation with the author’s handle, username, or screen name.

Here is an example of how to cite a tweet:

%%@CarlaHayden. “I’m so honored to talk about digital access at @UMBCHumanities. We want to share the @libraryofcongress collection.” Twitter , 13 Apr. 2017, 6:04 p.m., twitter.com/LibnOfCongress/status/852643691802091521.

While most citations begin with the name of the author, they do not necessarily have to. Quite often, sources are compiled by editors. Or, your source may be done by a performer or composer. If your project focuses on someone other than the author, it is acceptable to place that person’s name first in the citation. If you’re using the MLA works cited generator at Citation Machine.net, you can choose the individual’s role from a drop-down box.

For example, let’s say that in your research project, you focus on Leonardo DiCaprio’s performances as an actor. You’re quoting a line from the movie Titanic in your project, and you’re creating a complete citation for it in the works-cited list.

It is acceptable to show the reader that you’re focusing on Leonardo DiCaprio’s work by citing it like this in the MLA works-cited list:

%%DiCaprio, Leonardo, performer. Titanic . Directed by James Cameron. Paramount, 1997.

Notice that when citing an individual other than the author, place the individual’s role after their name. In this case, Leonardo DiCaprio is the performer.

This is often done with edited books, too. Place the editor’s name first (in reverse order), add a comma, and then add the word editor.

If you’re still confused about how to place the authors together in a citation, the tools at CitationMachine.net can help! Our website is easy to use and will create your citations in just a few clicks!

Titles and containers

The titles are written as they are found on the source and in title form, meaning the important words start with a capital.

Here’s an example of a properly written title:

Practical Digital Libraries: Books, Bytes, and Bucks.

Wondering whether to place your title in italics or quotation marks? It depends on whether the source sits by itself or not. If the source stands alone, meaning that it is an independent source, place the title in italics. If the title is part of a larger whole, place the title of the source in quotation marks and the source it is from in italics.

When citing full books, movies, websites, or albums in their entirety, these titles are written in italics.

However, when citing part of a source, such as an article on a website, a chapter in a book, a song on an album, or an article in a scholarly journal, the part is written with quotation marks and then the titles of the sources that they are found in are written in italics.

Here are some examples to help you understand how to format titles and their containers.

To cite Pink Floyd’s entire album, The Wall , cite it as:

%%Pink Floyd. The Wall. Columbia, 1979.

To cite one of the songs on Pink Floyd’s album in MLA formatting, cite it as:

%%Pink Floyd. “Another Brick in the Wall (Part I).” The Wall, Columbia, 1979, track 3.

To cite a fairy tale book in its entirety, cite it as:

%%Colfer, Chris. The Land of Stories. Little Brown, 2016.

To cite a specific story or chapter in the book, cite it as:

%%Colfer, Chris. “Little Red Riding Hood.” The Land of Stories, Little Brown, 2016, pp. 58-65.

More about containers

From the section above, you can see that titles can stand alone, or they can sit in a container. Many times, sources can sit in more than one container. Wondering how? When citing an article in a scholarly journal, the first container is the journal. The second container? It’s the database that the scholarly journal is found in. It is important to account for all containers, so readers are able to locate the exact source themselves.

When citing a television episode, the first container is the name of the show and the second container is the name of the service that it could be streaming on, such as Netflix .

If your source sits in more than one container, the information about the second container is found at the end of the citation.

Use the following format to cite your source with multiple containers :

%%Last name of the author, First name of the author. “Source’s Title.” Container’s Title, roles and names of any other individuals who helped contribute to the source, the version of the source, any numbers associated with the source, the name of the publisher, the date the source was published, the location where individuals can find the source themselves (usually a URL or page range). Title of Second Container, roles and names of any other contributors, the version of the second container, any numbers associated with the second container, the name of the second container’s publisher, the date the second container was published, location.

If the source has more than two containers, add on another full section at the end for each container.

Not all of the fields in the citation format above need to be included in your citation. In fact, many of these fields will most likely be omitted from your citations. Only include the elements that will help your readers locate the source themselves.

Here is an example of a citation for a scholarly journal article found in a database. This source has two containers: the journal itself is one container, and the site it sits on is the other.

%%Zanetti, Francois. “Curing with Machine: Medical Electricity in Eighteenth-Century Paris.” Technology and Culture, vol. 54, no. 3, July 2013, pp. 503-530. Project Muse, muse.jhu.edu/article/520280.

If you’re still confused about containers, the Citation Machine MLA cite generator can help! MLA citing is easier when using the tools at CitationMachine.net.

Other contributors

Many sources have people besides the author who contribute to the source. If your research project focuses on an additional individual besides the author, or you feel as though including other contributors will help the reader locate the source themselves, include their names in the citation.

To include another individual in the citation, after the title, place the role of the individual, the word “by,” and then their name in standard order.

If the name of the contributor comes after a period, capitalize the first letter in the role of the individual. If it comes after a comma, the first letter in the role of the individual is lowercased.

Here’s an example of a citation for a children’s book with the name of the illustrator included:

%%Rubin, Adam. Dragons Love Tacos. Illustrated by Daniel Salmieri, Penguin, 2012.

The names of editors, directors, performers, translators, illustrators, and narrators can often be found in this part of the citation.

If the source that you’re citing states that it is a specific version or edition, this information is placed in the “versions” section of the citation.

When including a numbered edition, do not type out the number, use the numeral. Also, abbreviate the word “edition” to “ed.”

Here is an example of a citation with a specific edition:

%%Koger, Gregory. “Filibustering and Parties in the Modern State.” Congress Reconsidered, edited by Lawrence C. Dodd and Bruce I. Oppenheimer, 10th ed., CQ Press, 2013, pp. 221-236. Google Books, books.google.com/books?id=b7gkLlSEeqwC&lpg=PP1&dq=10th%20edition&pg=PR6#v=onepage&q=10th%20edition&f=false.

Many sources have numbers associated with them. If you see a number different than the date, page numbers, or editions, include this information in the “numbers” section of the citation. For MLA citing, this includes volume and/or issue numbers (use the abbreviations vol. and no.), episode numbers, track numbers, or any other numbers that will help readers identify the specific source that you used. Do not include ISBN (International Standard Book Numbers) in the citation.

It is important to include the name of the publisher (the organization that created or published the source), so that readers can locate the exact source themselves.

Include publishers for all sources except periodicals. Also, for websites, exclude this information when the name of the publisher matches the name of the website. Furthermore, the name of the publisher is often excluded from the citation for second containers, since the publisher of the second container is not necessarily responsible for the creation or production of the source’s content.

Publication dates

Publication dates are extremely important to include in citations. They allow the reader to understand when sources were published. They are also used when readers are attempting to locate the source themselves.

Dates can be written in MLA in one of two ways. Researchers can write dates as:

Day Mo. Year

Mo. Day, Year

Whichever format you decide to use, use the same format for all of your citations. If using the Citation Machine citation generator, the date will be formatted in the same way for each citation.

While it isn’t necessary to include the full date for all source citations, use the amount of information that makes the most sense to help your readers understand and locate the source themselves.

Wondering what to do when your source has more than one date? Use the date that is most applicable to your research.

The location generally refers to the place where the readers can find the source. This includes page ranges, URLs, DOI numbers, track numbers, disc numbers, or even cities and towns.

You can usually leave out http:// or https:// from URLs unless you want to hyperlink them. For DOIs, use http:// or https:// before the DOI: https://doi.org/xx.xxxx/xxx.xxxx.xxxx .

For page numbers, when citing a source found on only one page, use p.

Example: p. 6.

When citing a source that has a page range, use pp. and then add the page numbers.

Example: pp. 24-38.

Since the location is the final piece of the citation, place a period at the end. When it comes to URLs, many students wonder if the links in citations should be live or not. If the paper is being shared electronically with a teacher and other readers, it may be helpful to include live links. If you’re not sure whether to include live links or not, ask your teacher or professor for guidance.

Looking for an online tool to do the work for you? Citation Machine citing tools could help! Our site is simple (and fun!) to use.

Need some more help? There is further good information here .

Common Citation Examples

ALL sources use this format:

%%Last name of the author, First name of the author. “Source’s Title.” Container’s Title, roles and names of any other individuals who helped contribute to the source, the version of the source, any numbers associated with the source, the name of the publisher, the date the source was published, the location where individuals can find the source themselves (usually a URL or page range). *Title of Second Container, roles and names of any other contributors, the version of the second container, any numbers associated with the second container, the name of the second container’s publisher, the date the second container was published, location.

*If the source does not have a second container, omit this last part of the citation.

Remember, the Citation Machine MLA formatter can help you save time and energy when creating your citations. Check out our MLA Citation Machine pages to learn more.

• Journal Articles

How to Format a Paper

When it comes to formatting your paper or essay for academic purposes, there are specific MLA paper format guidelines to follow.

• Use paper that is 8½-by-11 inch in size. This is the standard size for copier and printer paper.
• Use high quality paper.
• Your research paper or essay should have a one-inch margin on the top, bottom, left, and right sides of the paper.
• While most word processors automatically format your paper to have one-inch margins, you can check or modify the margins of your paper by going to the “Page setup” section of your word processor.

Which font is acceptable to use?

• Use an easily readable font, specifically one that allows readers to see the difference between regular and italicized letters.
• Times New Roman, Arial, and Helvetica are recommended options.
• Use 12-point size font.

Should I double-space the paper, including citations?

• Double-space the entire paper.
• There should be a double space between each piece of information in the heading.
• Place a double space between the heading and the title.
• Place a double space between the title and the beginning of the essay.
• The works-cited list should be double-spaced as well. All citations are double-spaced.

Justification & Punctuation

• Text should be left-justified, meaning that the text is aligned, or flush, against the left margin.
• Indents signal to the reader that a new concept or idea is about to begin.
• Use the “tab” button on your keyboard to create an indent.
• Add one space after all punctuation marks.

Heading & Title

• Include a proper heading and title
• The heading should include the following, on separate lines, starting one inch from the top and left margins:
• Your full name
• Your teacher or professor’s name
• The course number
• Dates in the heading and the body of your essay should be consistent. Use the same format, either Day Month Year or Month Day, Year throughout the entire paper
• Examples: 27 July 2017 or July 27, 2017
• The title should be underneath the heading, centered in the middle of the page, without bold, underlined, italicized, or all capital letters.

Page numbers

• Number all pages, including the very first page and the works-cited list.
• Place page numbers in the top right corner, half an inch from the top margin and one inch from the right margin.
• Include your last name to the left of the page number. Example: Jacobson 4

Here’s an example to provide you with a visual:

If you need help with sentence structure or grammar, check out our paper checker. The paper checker will help to check every noun , verb , and adjective . If there are words that are misspelled or out of place, the paper checker will suggest edits and provide recommendations.

• If a citation flows onto the second line, indent it in half an inch from the left margin (called a “hanging indent”).
• For more information on the works-cited list, refer to “How to Make a Works Cited Page,” which is found below.

How to Create a Title Page

According to the Modern Language Association’s official guidelines for formatting a research paper, it is unnecessary to create or include an individual title page, or MLA cover page, at the beginning of a research project. Instead, follow the directions above, under “Heading & Title,” to create a proper heading. This heading is featured at the top of the first page of the research paper or research assignment.

If your instructor or professor does in fact require or ask for an MLA title page, follow the directions that you are given. They should provide you with the information needed to create a separate, individual title page. If they do not provide you with instructions, and you are left to create it at your own discretion, use the header information above to help you develop your research paper title page. You may want to include other information, such as the name of your school or university.

How to Make a Works Cited Page

The MLA Works Cited page is generally found at the end of a research paper or project. It contains a list of all the citations of sources used for the research project. Follow these directions to format the works-cited list to match the Modern Language Association’s guidelines.

• The “Works Cited” page has its own page at the end of a research project.
• Include the same running head as the rest of the project (Your last name and then the page number). The “Works Cited” page has the final page number for the project.
• Name the page “Works Cited,” unless your list only includes one citation. In that case, title it in MLA “Work Cited.”
• The title of the page (either “Works Cited” or “Work Cited”) is placed one inch from the top of the page, centered in the middle of the document.
• Double space the entire document, even between the title of the page and the first citation.
• Citations are listed in alphabetical order by the first word in the citation (usually the last name of the author or the first word in the title if the citation does not include the author’s name. Ignore “A,” “An,” and “The” if the title begins with these words.)
• If there are multiple citations by the same author, place them in chronological order by the date published.
• Also, instead of writing the author’s name twice in both citations, use three hyphens.

%%Angelou, Maya. I Know Why the Caged Bird Sings. Random House, 2009.

%%---. Gather Together in My Name. Random House, 1974.

• All citations begin flush against the left margin. If the citation is long and rolls onto a second or third line, indent the lines below the first line half an inch from the left margin. This is called a “hanging indent.” The purpose of a hanging indent is to make the citations easier to read. If you’re using our MLA citation machine, we’ll format each of your references with a hanging indent for you.

%%Wai-Chung, Ho. “Political Influences on Curriculum Content and Musical Meaning: Hong Kong Secondary Music Education, 1949-1997.” Journal of Historical Research in Music Education, vol. 22, no. 1, 1 Oct. 2000, pp. 5-25. Periodicals Index Online, search-proquest-com.i.ezproxy.nypl.org/pio/docview/1297849364/citation/6B70D633F50C4EA0PQ/78?accountid=35635.

• MLA “Works Cited” pages can be longer than one page. Use as many pages as necessary. If you have only one source to cite, do not place the one citation below the text of your paper. In MLA, a “Work Cited” page is still created for that individual citation.

Here’s a sample paper to give you an idea of what an MLA paper could look like. Included at the end is an MLA “Works Cited” page example.

Looking to add a relevant image, figure, table, or musical score to your paper? Here’s the easy way to do it, while following guidelines set forth by the Modern Language Association:

• Place the image, figure, table, or music close to where it’s mentioned in the text.
• Provide source information and any additional notes directly below the image, figure, table, or music.

For tables:

• Label the table as “Table” followed by an arabic numeral such as “1.” Table 1 is the table closest to the beginning of the paper. The next table mentioned in the text would be Table 2, and so on.
• Create a title for the table and place it below the label. Capitalize all important words.
• The label (Table 1) and the title should be flush against the left margin.
• Double-space everything.

• A figure can be a map, photograph, painting, pie chart, or any other type of image.
• Create a label and place it below the figure. The figure first mentioned in the text of the project is either “Figure 1” or “Fig 1.” Though figures are usually abbreviated to “Fig.” Choose one style and use it consistently. The next mentioned figure is “Figure 2” or “Fig. 2.”, and so on.
• Place a caption next to the label. If all of the source information is included in the caption, there isn’t a need to replicate that information in the works-cited list.

MLA Final Checklist

Think you’re through? We know this guide covered a LOT of information, so before you hand in that assignment, here’s a checklist to help you determine if you have everything you need:

_ Are both in-text and full citations included in the project? Remember, for every piece of outside information included in the text, there should be a corresponding in-text citation next to it. Include the full citation at the end, on the “Works Cited” page.

_ Are all citations, both in-text and full, properly formatted in MLA style? If you’re unsure, try out our citation generator!

_ Is your paper double-spaced in its entirety with one inch margins?

_ Do you have a running header on each page? (Your last name followed by the page number)

_ Did you use a font that is easy to read?

_ Are all citations on the MLA format works-cited list in alphabetical order?

Our plagiarism checker scans for any accidental instances of plagiarism. It scans for grammar and spelling errors, too. If you have an adverb , preposition , or conjunction that needs a slight adjustment, we may be able to suggest an edit.

Common Ways Students Accidentally Plagiarize

We spoke a bit about plagiarism at the beginning of this guide. Since you’re a responsible researcher, we’re sure you didn’t purposely plagiarize any portions of your paper. Did you know students and scholars sometimes accidentally plagiarize? Unfortunately, it happens more often than you probably realize. Luckily, there are ways to prevent accidental plagiarism and even some online tools to help!

Here are some common ways students accidentally plagiarize in their research papers and assignments:

1. Poor Paraphrasing

In the “How to create a paraphrase” section towards the top of this page, we share that paraphrases are “recycled information, in the paper writer’s own words and writing style.” If you attempt to paraphrase a few lines of text and it ends up looking and sounding too close to the original author’s words, it’s a poor paraphrase and considered plagiarism.

2. Incorrect Citations

If you cite something incorrectly, even if it’s done accidentally, it’s plagiarism. Any incorrect information in a reference, such as the wrong author name or the incorrect title, results in plagiarism.

3. Forgetting to include quotation marks

When you include a quote in your paper, you must place quotation marks around it. Failing to do so results in plagiarism.

If you’re worried about accidental plagiarism, try our Citation Machine Plus essay tool. It scans for grammar, but it also checks for any instances of accidental plagiarism. It’s simple and user-friendly, making it a great choice for stress-free paper editing and publishing.

Updated June 15, 2021

Written and edited by Michele Kirschenbaum and Wendy Ikemoto. Michele Kirschenbaum has been an awesome school librarian since 2006 and is an expert in citing sources. Wendy Ikemoto has a master’s degree in library and information science and has been working for Citation Machine since 2012.

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An MLA citation generator is a software tool designed to automatically create academic citations in the Modern Language Association (MLA) citation format. The generator will take information such as document titles, author, and URLs as in input, and output fully formatted citations that can be inserted into the Works Cited page of an MLA-compliant academic paper.

The citations on a Works Cited page show the external sources that were used to write the main body of the academic paper, either directly as references and quotes, or indirectly as ideas.

👩‍🎓 Who uses an MLA Citation Generator?

MLA style is most often used by middle school and high school students in preparation for transition to college and further education. Ironically, MLA style is not actually used all that often beyond middle and high school, with APA (American Psychological Association) style being the favored style at colleges across the country.

It is also important at this level to learn why it's critical to cite sources, not just how to cite them.

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Writing citations manually is time consuming and error prone. Automating this process with a citation generator is easy, straightforward, and gives accurate results. It's also easier to keep citations organized and in the correct order.

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It's super easy to create MLA style citations with our MLA Citation Generator. Scroll back up to the generator at the top of the page and select the type of source you're citing. Books, journal articles, and webpages are all examples of the types of sources our generator can cite automatically. Then either search for the source, or enter the details manually in the citation form.

The generator will produce a formatted MLA citation that can be copied and pasted directly into your document, or saved to MyBib as part of your overall Works Cited page (which can be downloaded fully later!).

MyBib supports the following for MLA style:

Daniel is a qualified librarian, former teacher, and citation expert. He has been contributing to MyBib since 2018.

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• Published: 01 April 2024

Complexity of avian evolution revealed by family-level genomes

• Josefin Stiller   ORCID: orcid.org/0000-0001-6009-9581 1 ,
• Shaohong Feng   ORCID: orcid.org/0000-0002-2462-7348 2 , 3 , 4 , 5 ,
• Al-Aabid Chowdhury 6 ,
• Iker Rivas-González   ORCID: orcid.org/0000-0002-0515-0628 7 ,
• David A. Duchêne   ORCID: orcid.org/0000-0002-5479-1974 8 ,
• Qi Fang   ORCID: orcid.org/0000-0002-9181-8689 9 ,
• Yuan Deng 9 ,
• Alexey Kozlov   ORCID: orcid.org/0000-0001-7394-2718 10 ,
• Alexandros Stamatakis   ORCID: orcid.org/0000-0003-0353-0691 10 , 11 , 12 ,
• Santiago Claramunt   ORCID: orcid.org/0000-0002-8926-5974 13 , 14 ,
• Jacqueline M. T. Nguyen   ORCID: orcid.org/0000-0002-3076-0006 15 , 16 ,
• Simon Y. W. Ho   ORCID: orcid.org/0000-0002-0361-2307 6 ,
• Brant C. Faircloth   ORCID: orcid.org/0000-0002-1943-0217 17 ,
• Julia Haag   ORCID: orcid.org/0000-0002-7493-3917 10 ,
• Peter Houde   ORCID: orcid.org/0000-0003-4541-5974 18 ,
• Joel Cracraft   ORCID: orcid.org/0000-0001-7587-8342 19 ,
• Metin Balaban 20 ,
• Uyen Mai 21 ,
• Guangji Chen   ORCID: orcid.org/0000-0002-9441-1155 9 , 22 ,
• Rongsheng Gao 9 , 22 ,
• Chengran Zhou   ORCID: orcid.org/0000-0002-9468-5973 9 ,
• Yulong Xie 2 ,
• Zijian Huang 2 ,
• Zhen Cao 23 ,
• Zhi Yan   ORCID: orcid.org/0000-0003-2433-5553 23 ,
• Huw A. Ogilvie   ORCID: orcid.org/0000-0003-1589-6885 23 ,
• Luay Nakhleh   ORCID: orcid.org/0000-0003-3288-6769 23 ,
• Bent Lindow   ORCID: orcid.org/0000-0002-1864-4221 24 ,
• Benoit Morel 10 , 11 ,
• Jon Fjeldså   ORCID: orcid.org/0000-0003-0790-3600 24 ,
• Peter A. Hosner   ORCID: orcid.org/0000-0001-7499-6224 24 , 25 ,
• Rute R. da Fonseca   ORCID: orcid.org/0000-0002-2805-4698 25 ,
• Bent Petersen   ORCID: orcid.org/0000-0002-2472-8317 8 , 26 ,
• Joseph A. Tobias   ORCID: orcid.org/0000-0003-2429-6179 27 ,
• Tamás Székely   ORCID: orcid.org/0000-0003-2093-0056 28 , 29 ,
• Jonathan David Kennedy 30 ,
• Andrew Hart Reeve   ORCID: orcid.org/0000-0001-5233-6030 24 ,
• Andras Liker 31 , 32 ,
• Martin Stervander   ORCID: orcid.org/0000-0002-6139-7828 33 ,
• Agostinho Antunes   ORCID: orcid.org/0000-0002-1328-1732 34 , 35 ,
• Dieter Thomas Tietze   ORCID: orcid.org/0000-0001-6868-227X 36 ,
• Mads Bertelsen 37 ,
• Fumin Lei   ORCID: orcid.org/0000-0001-9920-8167 38 , 39 ,
• Carsten Rahbek   ORCID: orcid.org/0000-0003-4585-0300 25 , 30 , 40 , 41 ,
• Gary R. Graves   ORCID: orcid.org/0000-0003-1406-5246 30 , 42 ,
• Mikkel H. Schierup   ORCID: orcid.org/0000-0002-5028-1790 7 ,
• Tandy Warnow 43 ,
• Edward L. Braun   ORCID: orcid.org/0000-0003-1643-5212 44 ,
• M. Thomas P. Gilbert   ORCID: orcid.org/0000-0002-5805-7195 8 , 45 ,
• Erich D. Jarvis 46 , 47 ,
• Siavash Mirarab   ORCID: orcid.org/0000-0001-5410-1518 48 &
• Guojie Zhang   ORCID: orcid.org/0000-0001-6860-1521 2 , 3 , 5 , 49  

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We are providing an unedited version of this manuscript to give early access to its findings. Before final publication, the manuscript will undergo further editing. Please note there may be errors present which affect the content, and all legal disclaimers apply.

• Evolutionary biology
• Genome evolution
• Molecular evolution
• Phylogenetics

Despite tremendous efforts in the past decades, relationships among main avian lineages remain heavily debated without a clear resolution. Discrepancies have been attributed to diversity of species sampled, phylogenetic method, and the choice of genomic regions 1–3 . Here, we address these issues by analyzing genomes of 363 bird species 4 (218 taxonomic families, 92% of total). Using intergenic regions and coalescent methods, we present a well-supported tree but also a remarkable degree of discordance. The tree confirms that Neoaves experienced rapid radiation at or near the Cretaceous–Paleogene (K–Pg) boundary. Sufficient loci rather than extensive taxon sampling were more effective in resolving difficult nodes. Remaining recalcitrant nodes involve species that challenge modeling due to extreme GC content, variable substitution rates, incomplete lineage sorting, or complex evolutionary events such as ancient hybridization. Assessment of the impacts of different genomic partitions showed high heterogeneity across the genome. We discovered sharp increases in effective population size, substitution rates, and relative brain size following the K–Pg extinction event, supporting the hypothesis that emerging ecological opportunities catalyzed the diversification of modern birds. The resulting phylogenetic estimate offers novel insights into the rapid radiation of modern birds and provides a taxon-rich backbone tree for future comparative studies.

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Authors and affiliations.

Section for Ecology and Evolution, Department of Biology, University of Copenhagen, Copenhagen, Denmark

Josefin Stiller

Center for Evolutionary & Organismal Biology, & Women’s Hospital, Zhejiang University School of Medicine, Hangzhou, China

Shaohong Feng, Yulong Xie, Zijian Huang & Guojie Zhang

Liangzhu Laboratory, Zhejiang University Medical Center, Hangzhou, China

Shaohong Feng & Guojie Zhang

Department of General Surgery, Sir Run-Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China

Shaohong Feng

Innovation Center of Yangtze River Delta, Zhejiang University, Jiashan, China

School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales, Australia

Al-Aabid Chowdhury & Simon Y. W. Ho

Bioinformatics Research Centre, Aarhus University, Aarhus, Denmark

Iker Rivas-González & Mikkel H. Schierup

Center for Evolutionary Hologenomics, The Globe Institute, University of Copenhagen, Copenhagen, Denmark

David A. Duchêne, Bent Petersen & M. Thomas P. Gilbert

BGI-Shenzhen, Beishan Industrial Zone, Shenzhen, China

Qi Fang, Yuan Deng, Guangji Chen, Rongsheng Gao & Chengran Zhou

Computational Molecular Evolution Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany

Alexey Kozlov, Alexandros Stamatakis, Julia Haag & Benoit Morel

Institute of Computer Science, Foundation for Research and Technology Hellas, Heraklion, Greece

Alexandros Stamatakis & Benoit Morel

Institute for Theoretical Informatics, Karlsruhe Institute of Technology, Karlsruhe, Germany

Alexandros Stamatakis

Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada

Santiago Claramunt

Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada

College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia

Jacqueline M. T. Nguyen

Research Institute, Australian Museum, Sydney, New South Wales, Australia

Department of Biological Sciences and Museum of Natural Science, Louisiana State University, Baton Rouge, LA, USA

Brant C. Faircloth

Department of Biology, New Mexico State University, Las Cruces, NM, USA

Peter Houde

Department of Ornithology, American Museum of Natural History, New York, NY, USA

Joel Cracraft

Bioinformatics and Systems Biology Graduate Program, University of California San Diego, La Jolla, CA, USA

Metin Balaban

Computer Science and Engineering, University of California San Diego, La Jolla, CA, USA

College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China

Guangji Chen & Rongsheng Gao

Department of Computer Science, Rice University, Houston, TX, USA

Zhen Cao, Zhi Yan, Huw A. Ogilvie & Luay Nakhleh

Natural History Museum Denmark, University of Copenhagen, Copenhagen, Denmark

Bent Lindow, Jon Fjeldså, Peter A. Hosner & Andrew Hart Reeve

Center for Global Mountain Biodiversity, Globe Institute, University of Copenhagen, Copenhagen, Denmark

Peter A. Hosner, Rute R. da Fonseca & Carsten Rahbek

Centre of Excellence for Omics-Driven Computational Biodiscovery (COMBio), Faculty of Applied Sciences, AIMST University, Bedong, Kedah, Malaysia

Bent Petersen

Department of Life Sciences, Imperial College London, Silwood Park, Ascot, UK

Joseph A. Tobias

Milner Centre for Evolution, University of Bath, Bath, UK

Tamás Székely

ELKH-DE Reproductive Strategies Research Group, University of Debrecen, Debrecen, Hungary

Center for Macroecology, Evolution, and Climate, The Globe Institute, University of Copenhagen, Copenhagen, Denmark

Jonathan David Kennedy, Carsten Rahbek & Gary R. Graves

HUN-REN-PE Evolutionary Ecology Research Group, University of Pannonia, Veszprém, Hungary

Andras Liker

Behavioural Ecology Research Group, Center for Natural Sciences, University of Pannonia, Veszprém, Hungary

Bird Group, Natural History Museum, Akeman St, Tring, Hertfordshire, United Kingdom

Martin Stervander

CIIMAR/CIMAR, Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Porto, Portugal

Agostinho Antunes

Department of Biology, Faculty of Sciences, University of Porto, Porto, Portugal

NABU, Berlin, Germany

Dieter Thomas Tietze

Centre for Zoo and Wild Animal Health, Copenhagen Zoo, Frederiksberg, Denmark

Mads Bertelsen

Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing, China

College of Life Science, University of Chinese Academy of Sciences, Beijing, China

Institute of Ecology, Peking University, Beijing, China

Carsten Rahbek

Danish Institute for Advanced Study, University of Southern Denmark, Odense, Denmark

Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA

Gary R. Graves

University of Illinois Urbana-Champaign, Champaign, IL, USA

Tandy Warnow

Department of Biology, University of Florida, Gainesville, FL, USA

Edward L. Braun

University Museum, NTNU, Trondheim, Norway

M. Thomas P. Gilbert

Vertebrate Genome Lab, The Rockefeller University, New York, NY, USA

Erich D. Jarvis

Howard Hughes Medical Institute, Durham, NC, USA

University of California, San Diego, San Diego, CA, USA

Siavash Mirarab

Villum Center for Biodiversity Genomics, Department of Biology, University of Copenhagen, Copenhagen, Denmark

Guojie Zhang

You can also search for this author in PubMed   Google Scholar

Corresponding authors

Correspondence to Josefin Stiller , Siavash Mirarab or Guojie Zhang .

Supplementary information

Supplementary information.

This file contains Supplementary Methods and Supplementary Results.

Reporting Summary

Peer review file, supplementary data.

Table of all sequenced species with taxonomic grouping according to Howard & Moore. 4th Edition and accession numbers of the used genome assemblies. Given as a separate tab-delimited text file.

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Cite this article.

Stiller, J., Feng, S., Chowdhury, AA. et al. Complexity of avian evolution revealed by family-level genomes. Nature (2024). https://doi.org/10.1038/s41586-024-07323-1

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Received : 25 April 2023

Accepted : 15 March 2024

Published : 01 April 2024

DOI : https://doi.org/10.1038/s41586-024-07323-1

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Diagnostic Approach to Pulsatile Tinnitus : A Narrative Review

• 1 Department of Radiology & Biomedical Imaging, University of California, San Francisco
• 2 Department of Radiology & Radiological Science, Johns Hopkins University, Baltimore, Maryland
• 3 Department of Neurology, University of California, San Francisco
• 4 Department of Otolaryngology, University of California, San Francisco

Importance   Pulsatile tinnitus is a debilitating symptom affecting millions of Americans and can be a harbinger of hemorrhagic or ischemic stroke. Careful diagnostic evaluation of pulsatile tinnitus is critical in providing optimal care and guiding the appropriate treatment strategy.

Observations   An underlying cause of pulsatile tinnitus can be identified in more than 70% of patients with a thorough evaluation. We advocate categorizing the myriad causes of pulsatile tinnitus into structural, metabolic, and vascular groups. Structural causes of pulsatile tinnitus include neoplasms and temporal bone pathologic abnormalities. Metabolic causes of pulsatile tinnitus include ototoxic medications and systemic causes of high cardiac output. Vascular causes of pulsatile tinnitus include idiopathic intracranial hypertension and dural arteriovenous fistulas. This categorization facilitates a practical evaluation, referral, and treatment pattern.

Conclusions and Relevance   Categorizing the underlying cause of pulsatile tinnitus ensures that dangerous causes of pulsatile tinnitus are not missed, and that patients receive the appropriate care from the proper specialist when needed.

Read More About

Narsinh KH , Hui F , Saloner D, et al. Diagnostic Approach to Pulsatile Tinnitus : A Narrative Review . JAMA Otolaryngol Head Neck Surg. 2022;148(5):476–483. doi:10.1001/jamaoto.2021.4470

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• How to Cite a Journal Article | APA, MLA, & Chicago Examples

How to Cite a Journal Article | APA, MLA, & Chicago Examples

Published on March 9, 2021 by Jack Caulfield . Revised on January 17, 2024.

To cite an article from an academic journal, you need an in-text citation and a corresponding reference listing the name(s) of the author(s), the publication date, the article title and journal name, the volume and issue numbers, the page range, and the URL or DOI .

Different citation styles present this information differently. The main citation styles are APA , MLA , and Chicago style .

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Citing an article in apa style, citing an article in mla style, citing an article in chicago style, frequently asked questions about citations.

In an APA Style journal article reference , the article title is in plain text and sentence case, while the journal name appears in italics, in title case.

The in-text citation lists up to two authors; for three or more, use “ et al. ”

When citing a journal article in print or from a database, don’t include a URL. You can still include the DOI if available.

You can also cite a journal article using our free APA Citation Generator . Search by title or DOI to automatically generate a correct citation.

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In an MLA Works Cited entry for a journal article , the article title appears in quotation marks, the name of the journal in italics—both in title case.

List up to two authors in both the in-text citation and the Works Cited entry. For three or more, use “et al.”

A DOI is always included when available; a URL appears if no DOI is available but the article was accessed online . If you accessed the article in print and no DOI is available, you can omit this part.

You can also use our free MLA Citation Generator to create your journal article citations.

Generate accurate MLA citations with Scribbr

In Chicago notes and bibliography style, you include a bibliography entry for each source, and cite them in the text using footnotes .

A bibliography entry for a journal article lists the title of the article in quotation marks and the journal name in italics—both in title case. List up to 10 authors in full; use “et al.” for 11 or more.

In the footnote, use “et al.” for four or more authors.

A DOI or URL (preferably a DOI) is included for articles consulted online; for articles consulted in print, omit this part.

Chicago also offers an alternative author-date style of citation. Examples of how to cite journal articles in this style can be found here .

The elements included in journal article citations across APA , MLA , and Chicago style are the name(s) of the author(s), the title of the article, the year of publication, the name of the journal, the volume and issue numbers, the page range of the article, and, when accessed online, the DOI or URL.

In MLA and Chicago style, you also include the specific month or season of publication alongside the year, when this information is available.

The DOI is usually clearly visible when you open a journal article on an academic database. It is often listed near the publication date, and includes “doi.org” or “DOI:”. If the database has a “cite this article” button, this should also produce a citation with the DOI included.

If you can’t find the DOI, you can search on Crossref using information like the author, the article title, and the journal name.

The abbreviation “ et al. ” (Latin for “and others”) is used to shorten citations of sources with multiple authors.

“Et al.” is used in APA in-text citations of sources with 3+ authors, e.g. (Smith et al., 2019). It is not used in APA reference entries .

Use “et al.” for 3+ authors in MLA in-text citations and Works Cited entries.

Use “et al.” for 4+ authors in a Chicago in-text citation , and for 10+ authors in a Chicago bibliography entry.

Check if your university or course guidelines specify which citation style to use. If the choice is left up to you, consider which style is most commonly used in your field.

• APA Style is the most popular citation style, widely used in the social and behavioral sciences.
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• Chicago author-date style tends to be used in the sciences.

Other more specialized styles exist for certain fields, such as Bluebook and OSCOLA for law.

The most important thing is to choose one style and use it consistently throughout your text.

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CITEViz: interactively classify cell populations in CITE-Seq via a flow cytometry-like gating workflow using R-Shiny

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• Brittany M. Curtiss 1 ,
• Sarah A. Carratt 1 ,
• Theodore P. Braun 1 , 6 &
• Julia E. Maxson 1  

BMC Bioinformatics volume  25 , Article number:  142 ( 2024 ) Cite this article

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The rapid advancement of new genomic sequencing technology has enabled the development of multi-omic single-cell sequencing assays. These assays profile multiple modalities in the same cell and can often yield new insights not revealed with a single modality. For example, Cellular Indexing of Transcriptomes and Epitopes by Sequencing (CITE-Seq) simultaneously profiles the RNA transcriptome and the surface protein expression. The surface protein markers in CITE-Seq can be used to identify cell populations similar to the iterative filtration process in flow cytometry, also called “gating”, and is an essential step for downstream analyses and data interpretation. While several packages allow users to interactively gate cells, they often do not process multi-omic sequencing datasets and may require writing redundant code to specify gate boundaries. To streamline the gating process, we developed CITEViz which allows users to interactively gate cells in Seurat-processed CITE-Seq data. CITEViz can also visualize basic quality control (QC) metrics allowing for a rapid and holistic evaluation of CITE-Seq data.

We applied CITEViz to a peripheral blood mononuclear cell CITE-Seq dataset and gated for several major blood cell populations (CD14 monocytes, CD4 T cells, CD8 T cells, NK cells, B cells, and platelets) using canonical surface protein markers. The visualization features of CITEViz were used to investigate cellular heterogeneity in CD14 and CD16-expressing monocytes and to detect differential numbers of detected antibodies per patient donor. These results highlight the utility of CITEViz to enable the robust classification of single cell populations.

Conclusions

CITEViz is an R-Shiny app that standardizes the gating workflow in CITE-Seq data for efficient classification of cell populations. Its secondary function is to generate basic feature plots and QC figures specific to multi-omic data. The user interface and internal workflow of CITEViz uniquely work together to produce an organized workflow and sensible data structures for easy data retrieval. This package leverages the strengths of biologists and computational scientists to assess and analyze multi-omic single-cell datasets. In conclusion, CITEViz streamlines the flow cytometry gating workflow in CITE-Seq data to help facilitate novel hypothesis generation.

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The development of high-throughput single-cell RNA-Sequencing (scRNA-Seq) methods has revealed previously unappreciated levels of cellular heterogeneity [ 1 ]. Since the development of Drop-Seq in 2015, a number of scRNA-Seq assays have been developed to profile multiple macromolecules in the same cell. For example, CITE-Seq is a multi-omic variant of scRNA-Seq that captures the cell surface proteome using antibody-derived tags (ADT) [ 2 ]. Multi-omic assays like CITE-Seq introduce new dimensionality to the data, but often require nuanced analyses to extract meaningful results. For example, a common single cell analysis consists of unsupervised clustering of cells followed by the classification of cell populations. However, there can be low correlation of differential gene signatures and cell cluster identity, and the process is often time-consuming and irreproducible. By using the ADT information in CITE-Seq data, we aim to approximate a flow cytometry workflow to better classify cell clusters based on known surface identity markers.

The gating workflow in flow cytometry is the gold standard to classify cell populations using cellular surface protein markers. During a typical flow cytometry experiment, fluorescently-labeled antibodies stain cell surface proteins, and individual cells are identified based on fluorescent signal intensity [ 3 ]. Cells are then plotted in two dimensions based on surface marker abundance (e.g. CD38 and CD34), and boundaries are drawn (called gates) around cell populations of interest. Selected cells are further re-plotted in a new set of surface markers and filtered again until a population of interest is identified and quantified [ 4 ]. The gating workflow is essential to investigate biological perturbations (e.g. drug treatment in cancer cells) in which the proportional changes in cell populations are tracked. The same principles of gating can be applied to CITE-Seq [ 5 ], but to the best of our knowledge, the bioinformatics field currently lacks a robust program that facilitates this interactive process in Seurat-processed CITE-Seq data.

To efficiently gate cell populations in CITE-Seq data, we developed CITEViz. By using the R-Shiny platform, CITEViz allows users to interactively subset cell populations of interest using surface proteins and see those cells highlighted in latent space (e.g. PCA, tSNE, UMAP). Conversely, cell clusters can be selected in latent space and quickly located in a 2D feature scatter plot (called a back-gate). A secondary function of CITEViz is to provide basic multi-omic single/co-expression feature plots and quality control figures to allow biologists to quickly and holistically assess CITE-Seq data. In conclusion, CITEViz (1) streamlines the gating workflow in CITE-Seq data to identify cell populations and (2) facilitates basic visualization of multi-omic, single-cell sequencing data.

Implementation

A core design element of CITEViz is the Gate class—a custom S4 class written in base R (Fig.  1 A). In this paper, a “Gate” refers to an R class, while a “gate” refers to a manual selection and filtration of a cell population. A Gate class holds important metadata such as a user-provided gate label, X and Y axes labels (e.g. CD34, CD38), gate selection coordinates, input and output cell barcodes, and more. Most variables are intrinsic to a Gate class except for the output cell barcodes, which are passed between Gates objects to facilitate the gating workflow. Gate classes are created by the simultaneous actions of a Gate button press and a rectangular or polygonal selection of cells in the feature scatter plot (Fig.  1 B). The custom Gate class in CITEViz is necessary to store detailed gating information in an organized data structure.

Implementation of CITEViz. A Example of a custom Gate class, which contains a counter, input cell barcodes, output cell barcodes, the feature of the x and y axes, gate coordinates, and more. B Back-end of CITEViz. Gate classes are created immediately by the input of an interactive cell selection plus the trigger of the Gate button. All attributes of the Gate class are intrinsic to a gate, except for the output cells which are passed between gates. Unlike other packages, this process can be repeated to the nth degree in CITEViz. C Screenshot of the gating page in CITEViz with an example PBMC CITE-seq dataset [ 5 ]

The typical workflow of CITEViz can be distilled down to 4 steps. After uploading a preprocessed Seurat object and choosing the gating tab (Fig.  1 C), the user can then

Choose which cell surface markers to view in the 2D feature scatter plot on the left pane using a drop-down menu,

Select the cells of interest in the scatter plot,

Input into the text box a custom label, and

Click the “Gate” button to subset the cells of interest

Once a subset of cells is defined, steps 1–4 can be repeated to further analyze the filtered cells. As gates are created, they can be exported as an ordered list of Gate objects, which contains a variety of metadata (e.g. cell barcodes) to facilitate further analyses such as differential expression. In summary, the procedures to gate cells in CITEViz are to plot cell surface markers, select the cells, input a text label, and define the gate via the Gate button.

CITEViz uniquely supports a back-gate function. In the context of CITE-Seq data, back-gates allow users to select cells in latent space and highlight them in the protein feature plots. This feature is useful to explore whether a cell population can be clearly separated by two antibody features, or determine if a better combination of features can properly identify the cell cluster. Cells are initially plotted as gray dots and are colored black based on the selection of cells in the UMAP. The contour plot underneath the dots highlights the density of points. The back-gate function of CITEViz allows users to interactively explore gates and feature combinations that define a specific cell cluster.

At a minimum, CITEViz requires a Seurat object with a normalized ADT counts matrix. Normalization can be performed by the center-log ratio method [ 6 ], denoised and scaled by background [ 7 ], or a custom method that returns a data matrix under the ADT assay. Since the gating workflow relies on surface protein markers, RNA data normalization is optional but recommended for potential downstream analyses and basic QC visualization.

The two types of input data currently supported by CITEViz are (1) an R Data Serialized (RDS) file containing a Seurat object, or (2) an RDS file with a SingleCellExperiment object derived from the as.SingleCellExperiment() function from the Seurat library. Furthermore, CITEViz can be adapted to accommodate more data structures in future updates (refer to Limitations sub-section in Discussions).

CITEViz provides basic visualization of quality control (QC) metrics, single-feature, and feature co-expression plots. QC metrics include: RNA counts distribution, gene counts distribution, ADT counts distribution, and unique ADT antibodies; these plots can be split by any categorical metadata in the user’s Seurat object. Single feature expression plots allow users to see RNA/ADT expression in latent space, while multi-omic co-expression feature plots can visualize data between assays. This can important to investigate the correlation between transcriptomic expression (RNA) and protein levels (ADT). CITEViz provides basic visualization of QC metrics and single/multi-omic feature expression plots in addition to its primary function as a gating workflow in CITE-Seq data.

PBMC CITE-Seq gating analysis

To demonstrate the utility of this program, CITEViz was used to gate the major cell populations in a PBMC CITE-Seq dataset [ 5 ]. Several gating schemes were used to show the utility of CITEViz and to identify CD14 monocytes, CD4 T-cells, CD8 T-cells, Natural Killer (NK) cells, B-cells, and platelets. To reduce overplotting, the dataset was randomly down-sampled to 10 K cells and then uploaded to CITEViz.

One-step gating schemes were used to identify CD4 T-cells and CD14 monocytes using canonical surface protein markers [ 4 ]. Cells with a CD4-positive and CD3-positive protein profile were selected in the ADT Feature Plot, revealing a distinct cell population in the UMAP (Fig.  2 A). CD14-expressing monocytes were identified as CD14-positive and CD16-negative cells in the feature scatter plot [ 8 ]. The selected cells corresponded to a discrete cell population in the upper left quadrant in the UMAP (Fig.  2 B).

CITEViz analysis of PBMC CITE-Seq data. A Identification of CD4-expressing T-cells using CD4-positive and CD3-positive cells, B Identification of CD14-expressing monocyte cells with CD14-positive and CD11b-positive markers, C 2-layer gate that selects for CD8 T-cells. The first gate consists of CD3-positive cells, followed by a CD4-negative and CD8-positive gate. D Example back-gate of natural killer cells shown in an ADT Feature Plot with features of CD3and CD56. E Single-feature expression plot of CD8 protein levels. F 2-feature co-expression plot using CD16 and CD14 to show population heterogeneity in the monocyte cluster. G CITE-Seq QC metric ‘Number of Detected Antibodies per Cell’ split by individual donors

CD8 T-cells were identified with a 2-step gating scheme. An initial CD19-negative and CD3-positive gate selected for both CD4 and CD8 T cells (Fig.  2 C, left). From this gate, the cells were re-plotted and CD8 T cells were selected for a CD8-positive and CD4-negative protein expression profile [ 4 ].

Natural killer (NK) cells were identified in the scatter plots via a back-gate. Within the back-gate tab of CITEViz, NK cells were selected in the latent space according to prior annotations [ 5 ]. Once cells were selected, the ADT Feature Plot axes were adjusted to plot CD3 in the y-axis and CD56 in the x-axis based on known NK surface proteins [ 9 ]. The corresponding points were displayed in the scatter plot as dark-colored cells expressing a CD56-positive and CD3-negative profile. To identify gates for the remaining major cell populations in the dataset, back-gates for B cells and platelets are included in Additional file 1 : Fig. S1. B cells and platelets were also validated using prior [ 5 ] and external annotations, respectively [ 10 , 11 ].

The secondary function of CITEViz is to visualize commonly generated plots in multi-omic CITE-Seq data like single/co-expression plots and QC metrics. For example, we used CITEViz to generate a feature plot, revealing a distinctly high expression in the CD8 T-cell population (Fig.  2 E). A protein co-expression feature plot of CD14 and CD16 shows monocyte expressing both markers in the lower arm of the monocyte cluster (Fig.  2 F). This pattern was also noticeable in the bulk of the NK cells. An example of a QC metric that can be assessed with CITEViz is the number of unique antibodies detected. CITEViz can split this QC metric by individual patient donors, which clearly displayed a significant difference between patients 1–4 and patients 5–8 with a padj of 0 (Tukey HSD) (Fig.  2 G, Additional file 2 : Table S1). In conclusion, the ability to visualize multi-omic CITE-Seq data allows for rapid data exploration and assessment of Seurat-processed datasets.

Discussions

The application of CITEViz to a PBMC CITE-Seq dataset [ 5 ] led to the identification of 6 major cell populations (CD4 T cells, CD14 monocytes, CD8 T cells, NK cells, B cells, platelets) using a mix of one- or two-step gates and back-gates (Fig.  2 A–D, Additional file 1 : Fig. S1). Protein expression data were explored using single and co-expression feature plots, where the latter revealed cellular heterogeneity in CD14 and CD16-expressing monocytes (Fig.  2 E, F ). By plotting the number of detected antibodies per sample , CITEViz displayed a significant difference between patients 1–4 and 5–8. These results are in line with prior analyses and suggest that the flow cytometry-like gating workflow in CITEViz provided an alternative approach to easily classify clusters in CITE-Seq data [ 5 ].

CITEViz compared to other programs

The bioinformatics field, to the best of our knowledge, currently lacks an open-source, R-Shiny package that can (1) streamline the flow cytometry gating process and (2) generate basic multi-omic plots in Seurat-processed CITE-Seq data (Table  1 ). While the Single-Cell Virtual Cytometer by Pont et. al. is most functionally similar to CITEViz, it requires a custom tab-separated input file and is limited to exporting the cell names in the last gated population [ 12 ]. The Cascading Style Sheet and JavaScript framework in Pont et. al. also can introduce friction with common single-cell analysis packages written in R or Python, thus requiring the user to write additional scripts that import cell barcodes for downstream analyses. In contrast, CITEViz enhances reproducibility by including important gating metadata such as surface protein markers, gate coordinates, and previous filtration steps.

Another similar tool is the Interactive SummarizedExperiment Explorer (iSEE). iSEE is an R-Shiny package from BioConductor that provides a visual interface to explore single-cell datasets, but it lacks an iterative filtration feature that is essential to recreate the flow cytometry gating workflow [ 13 ]. Additionally, iSEE was originally optimized for CyTOF and scRNA-Seq data in SingleCellExperiment format, but is incompatible with the multi-assay structure of CITE-Seq datasets. Unlike other programs, CITEViz fills an unmet need by (1) implementing a seamless flow cytometry gating workflow and (2) generating basic multi-omic plots in Seurat-processed CITE-Seq data.

While the flow cytometry gating workflow can be approximated using Seurat [ 5 ], the process can be cumbersome and inefficient. The typical workflow to gate cells in Seurat would be to (1) generate a scatter plot with FeatureScatter() and save it as a variable, (2) apply CellSelector() to the feature plot, (3) draw boundaries around the cells of interest in an interactive window, (4) exit the window and repeat steps 1–4 to further filter down cells of interest [ 5 ]. A disadvantage of this process is that the gated cells are not immediately highlighted in latent space, resulting in a loss of contextual information. Furthermore, this method requires extensive attention from the user to write redundant code and keep track of many variables. CITEViz improves upon Seurat by displaying relevant parameters and plots in the R-Shiny interface, providing an efficient user experience with continuous visual feedback.

Limitations

A limitation of CITEViz pertains to data sparsity where gating cells by gene expression (RNA) results in a high rate of data dropout [ 14 ]. For example, plotting RNA scatter plots using two transcription factors like IRF8 and CEBPA lead to plots that are difficult to biologically interpret (Additional file 1 : Fig. S2). Fortunately, surface protein data (ADT assays) are not sparse and are a reliable resource to characterize cell populations. We speculate the development of better scRNA sequencing assays (and their multi-omic variants) will better resolve heterogeneous cell populations in the future, so CITEViz was built to gate cells based on any assays (RNA, ADT, SCT) and features to accommodate future improvements in sequencing technology.

In addition to sequencing assays, the ever-shifting landscape of bioinformatic file formats can affect compatibility with CITEViz in the future. Currently, CITEViz accepts Seurat and BioConductor SingleCellExperiment objects. To account for the imminent introduction of new file formats or data structures, CITEViz was modularly built to accept various input file types. This is done by various functions that check the input file types and data structures, then building new sub-functions that retrieve the necessary data. The modular design of CITEViz means it can be adequately maintained to accept new file formats and data structures in the future.

Intended audience

CITEViz is intended to be used by biologists familiar with flow cytometry and who can either (1) perform basic single-cell analysis or (2) collaborate in a team with a computational scientists. The input data format for CITEViz is a pre-processed Seurat object, which requires a basic level of coding skills in R and the ability to follow public Seurat vignettes. Since the essential feature of CITEViz is its iterative filtering process, it is not intended for any data preprocessing or normalization. In our experience, we found CITEViz to be a uniquely collaborative tool that leverages the strengths of both bench and computational scientists to explore and analyze data together.

CITEViz is an R-Shiny package that facilitates a seamless gating workflow in Seurat-processed CITE-Seq data. Its secondary function is to view basic quality control metrics and multi-omic co-expression plots for data exploration and assessment. By standardizing the gating process, we provide an alternative method for cell cluster classification that is (1) more intuitive for biologists to use, (2) avoids cumbersome and disorganized alternative workflows, and (3) is biologically grounded in established techniques of flow cytometry. CITEViz was ultimately designed to facilitate novel hypothesis generation, and is available to download on GitHub [ 15 ].

Availability and requirements

Project name : CITEViz

Project home page : https://github.com/maxsonBraunLab/CITEViz

Operating system : Windows/Linux/MacOS

Programming language : R

Other requirements : R >  = 4.2.0

License : MIT

Any restrictions to use by non-academics : license needed

Availability of data and materials

The original data underlying this article are available in GEO (Gene Expression Omnibus) at https://www.ncbi.nlm.nih.gov/geo/ , and can be accessed with GSE164378. The dataset analyzed during the current study is available in the Zenodo repository, https://zenodo.org/records/10839852 . The CITEViz documentation website can be accessed here https://maxsonbraunlab.github.io/CITEViz/ .

Abbreviations

Cellular Indexing of Transcriptomes and Epitopes by Sequencing

Single-Cell RNA-Sequencing

Ribonucleic acid

Antibody-Derived Tag

R Data Serialized

Single-Cell Transform

Principal Component Analysis

T-Distriuted Stochastic Neighbor Embedding

Uniform Manifold Approximation and Projection

Peripheral Blood Mononuclear Cells

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Acknowledgements

We thank the following Oregon Health and Science University core facilities for their assistance: ExaCloud Cluster Computational Resource and the Advanced Computing Center.

This work was supported by the American Society of Hematology Research Restart Award; American Society of Hematology Scholar Award; National Cancer Institute [K08 CA245224] to TPB. Funding for SAC was provided by the American Society of Hematology Research Restart Award; Collin’s Medical Trust Award; Medical Research Foundation Early Clinical Award; and the National Cancer Institute [F32CA239422]. JEM is supported by a Leukemia & Lymphoma Society Scholar Award and R01 HL157147-01.

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Garth L. Kong, Thai T. Nguyen, Wesley K. Rosales, Anjali D. Panikar and John H. W. Cheney contributed equally to the project.

Authors and Affiliations

Division of Oncologic Sciences, Knight Cancer Institute, Oregon Health and Science University, 3181 SW Sam Jackson Pk. Rd., KR-HEM, Portland, OR, 97239, USA

Garth L. Kong, Thai T. Nguyen, William M. Yashar, Brittany M. Curtiss, Sarah A. Carratt, Theodore P. Braun & Julia E. Maxson

Earle A. Chiles Research Institute, Providence, Portland, OR, 97213, USA

Wesley K. Rosales

Knight Campus Graduate Internship Program - Bioinformatics, University of Oregon, Eugene, OR, 97403, USA

Anjali D. Panikar & John H. W. Cheney

Cancer Early Detection Advanced Research, Oregon Health and Science University, Portland, OR, 97238, USA

Theresa A. Lusardi

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William M. Yashar

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Contributions

TPB identified a need for a program like CITEViz. GLK conceived the design, managed development, and wrote the manuscript. TTN, WKR, ADP, JHWC developed the front and back-end of the program. SAC and BMC tested CITEViz prototypes. TAL and WMY contributed software. BMC, SAC, TPB and JEM interpreted results. All authors have read and approved the final manuscript.

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JEM receives funding or collaborates with Blueprint Medicines, Kura Oncology and Ionis Pharmaceuticals. WMY is a former employee of Abreos Biosciences, Inc. and was compensated in part with common stock options. Pursuant to the merger and reorganization agreement between Abreos Biosciences, Inc. and Fimafeng, Inc., WMY surrendered all of his common stock options in 03/2021. TPB has received research support from AstraZeneca, Blueprint Medicines as well as Gilead Sciences and is the institutional PI on the FRIDA trial sponsored by Oryzon Genomics. The other authors declare that they have no competing interests.

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Supplementary Information

Additional file 1..

Back-gate schemes for B-cells and platelets, and an example gate using scRNA-Seq data.

Additional file 2.

Tukey Honestly Significant Difference Test of Detected Antibodies per Patient Donor.

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Kong, G.L., Nguyen, T.T., Rosales, W.K. et al. CITEViz: interactively classify cell populations in CITE-Seq via a flow cytometry-like gating workflow using R-Shiny. BMC Bioinformatics 25 , 142 (2024). https://doi.org/10.1186/s12859-024-05762-1

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Correction: Vector competence of Ixodes ricinus instars for the transmission of Borrelia burgdorferi sensu lato in different small mammalian hosts

• Lars K. Lindsø 1 ,
• Hildegunn Viljugrein 1 , 2 &
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Parasites & Vectors volume  17 , Article number:  170 ( 2024 ) Cite this article

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Correction: Parasites & Vectors (2024) 17:23 https://doi.org/10.1186/s13071-023-06110-7

Following publication of the original article [ 1 ], it came to the authors’ attention that results regarding larval Ixodes ricinus feeding success in wood mice (“ Apodemus sylvaticus , 36%”) and bank voles (“ Myodes glareolus , 31%”) had been interchanged in the abstract and graphical abstract of the article. The article has since been corrected. The authors thank you for reading this erratum and apologize for any inconvenience caused.

Lindsø LK, Viljugrein H, Mysterud A. Vector competence of Ixodes ricinus instars for the transmission of Borrelia burgdorferi sensu lato in different small mammalian hosts. Parasit Vectors. 2024;17:23. https://doi.org/10.1186/s13071-023-06110-7 .

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Lindsø, L.K., Viljugrein, H. & Mysterud, A. Correction: Vector competence of Ixodes ricinus instars for the transmission of Borrelia burgdorferi sensu lato in different small mammalian hosts. Parasites Vectors 17 , 170 (2024). https://doi.org/10.1186/s13071-024-06249-x

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Published : 02 April 2024

DOI : https://doi.org/10.1186/s13071-024-06249-x

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