how to put references in a scientific paper

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Scientific Style and Format Citation Quick Guide

Scientific Style and Format presents three systems for referring to references (also known as citations) within the text of a journal article, book, or other scientific publication: 1) citation–sequence; 2) name–year; and 3) citation–name. These abbreviated references are called in-text references. They refer to a list of references at the end of the document.

The system of in-text references that you use will determine the order of references at the end of your document. These end references have essentially the same format in all three systems, except for the placement of the date of publication in the name–year system.

Though Scientific Style and Format now uses citation–sequence for its own references, each system is widely used in scientific publishing. Consult your publisher to determine which system you will need to follow.

Click on the tabs below for more information and to see some common examples of materials cited in each style, including examples of electronic sources. For numerous specific examples, see Chapter 29 of the 8th edition of Scientific Style and Format .

Citation–Sequence and Citation–Name

The following examples illustrate the citation–sequence and citation–name systems. The two systems are identical except for the order of references. In both systems, numbers within the text refer to the end references.

In citation–sequence, the end references are listed in the sequence in which they first appear within the text. For example, if a reference by Smith is the first one mentioned in the text, then the complete reference to the Smith work will be number 1 in the end references. The same number is used for subsequent in-text references to the same document.

In citation–name, the end references are listed alphabetically by author. Multiple works by the same author are listed alphabetically by title. The references are numbered in that sequence, such that a work authored by Adam is number 1, Brown is number 2, and so on. Numbers assigned to the end references are used for the in-text references regardless of the sequence in which they appear in the text of the work. For example, if a work by Zielinski is number 56 in the reference list, each in-text reference to Zielinski will be number 56 also.

List authors in the order in which they appear in the original text, followed by a period. Periods also follow article and journal title and volume or issue information. Separate the date from volume and issue by a semicolon. The location (usually the page range for the article) is preceded by a colon.

Author(s). Article title. Journal title. Date;volume(issue):location.

Journal titles are generally abbreviated according to the List of Title Word Abbreviations maintained by the ISSN International Centre. See Appendix 29.1 in Scientific Style and Format for more information.

For articles with more than 1 author, names are separated by a comma.

Smart N, Fang ZY, Marwick TH. A practical guide to exercise training for heart failure patients. J Card Fail. 2003;9(1):49–58.

For articles with more than 10 authors, list the first 10 followed by “et al.”

Pizzi C, Caraglia M, Cianciulli M, Fabbrocini A, Libroia A, Matano E, Contegiacomo A, Del Prete S, Abbruzzese A, Martignetti A, et al. Low-dose recombinant IL-2 induces psychological changes: monitoring by Minnesota Multiphasic Personality Inventory (MMPI). Anticancer Res. 2002;22(2A):727–732.

Volume with no issue or other subdivision

Laskowski DA. Physical and chemical properties of pyrethroids. Rev Environ Contam Toxicol. 2002;174:49–170.

Volume with issue and supplement

Gardos G, Cole JO, Haskell D, Marby D, Paine SS, Moore P. The natural history of tardive dyskinesia. J Clin Pharmacol. 1988;8(4 Suppl):31S–37S

Volume with supplement but no issue

Heemskerk J, Tobin AJ, Ravina B. From chemical to drug: neurodegeneration drug screening and the ethics of clinical trials. Nat Neurosci. 2002;5 Suppl:1027–1029.

Multiple issue numbers

Ramstrom O, Bunyapaiboonsri T, Lohmann S, Lehn JM. Chemical biology of dynamic combinatorial libraries. Biochim Biophys Acta. 2002;1572(2–3):178–186.

Issue with no volume

Sabatier R. Reorienting health and social services. AIDS STD Health Promot Exch. 1995;(4):1–3.

Separate information about author(s), title, edition, and publication by periods. The basic format is as follows:

Author(s). Title. Edition. Place of publication: publisher; date. Extent. Notes.

Extent can include information about pagination or number of volumes and is considered optional. Notes can include information of interest to the reader, such as language of publication other than English; such notes are optional.

Essential notes provide information about location, such as a URL for online works. See Chapter 29 for more information.

For books with more than 1 author, names are separated by a comma.

Ferrozzi F, Garlaschi G, Bova D. CT of metastases. New York (NY): Springer; 2000.

For books with more than 10 authors, list the first 10 followed by “et al.”

Wenger NK, Sivarajan Froelicher E, Smith LK, Ades PA, Berra K, Blumenthal JA, Certo CME, Dattilo AM, Davis D, DeBusk RF, et al. Cardiac rehabilitation. Rockville (MD): Agency for Health Care Policy and Research (US); 1995.

Organization as author

Advanced Life Support Group. Acute medical emergencies: the practical approach. London (England): BMJ Books; 2001.

Author(s) plus editor(s) or translator(s)

Klarsfeld A, Revah F. The biology of death: origins of mortality. Brady L, translator. Ithaca (NY): Cornell University Press; 2003.

Luzikov VN. Mitochondrial biogenesis and breakdown. Galkin AV, translator; Roodyn DB, editor. New York (NY): Consultants Bureau; 1985.

Chapter or other part of a book, same author(s)

Gawande A. The checklist manifesto: how to get things right. New York (NY): Metropolitan Books; 2010. Chapter 3, The end of the master builder; p. 48–71.

Chapter or other part of a book, different authors

Rapley R. Recombinant DNA and genetic analysis. In: Wilson K, Walker J, editors. Principles and techniques of biochemistry and molecular biology. 7th ed. New York (NY): Cambridge University Press; 2010. p. 195–262.

Multivolume work as a whole

Alkire LG, editor. Periodical title abbreviations. 16th ed. Detroit (MI): Thompson Gale; 2006. 2 vol. Vol. 1, By abbreviation; vol. 2, By title.

Dissertations and Theses

Lutz M. 1903: American nervousness and the economy of cultural change [dissertation]. [Stanford (CA)]: Stanford University; 1989.

Blanco EE, Meade JC, Richards WD, inventors; Ophthalmic Ventures, assignee. Surgical stapling system. United States patent US 4,969,591. 1990 Nov 13.

Weiss R. Study shows problems in cloning people: researchers find replicating primates will be harder than other mammals. Washington Post (Home Ed.). 2003 Apr 11;Sect. A:12 (col. 1).

Indicate a copyright date with a lowercase “c”.

Johnson D, editor. Surgical techniques in orthopaedics: anterior cruciate ligament reconstruction [DVD]. Rosemont (IL): American Academy of Orthopaedic Surgeons; c2002. 1 DVD.

Websites and Other Online Formats

References to websites and other online formats follow the same general principles as for printed references, with the addition of a date of update/revision (if available) along with an access date and a URL.

Title of Homepage. Edition. Place of publication: publisher; date of publication [date updated; date accessed]. Notes.

If no date of publication can be determined, use a copyright date (if available), preceded by “c”. Include the URL in the notes.

APSnet: plant pathology. St Paul (MN): American Phytopathological Association; c1994–2005 [accessed 2005 Jun 20]. http://www.apsnet.org/.

Online journal article

Author(s) of article. Title of article. Title of journal (edition). Date of publication [date updated; date accessed];volume(issue):location. Notes.

A DOI (Digital Object Identifier) may be included in the notes in addition to a URL, if available:

Savage E, Ramsay M, White J, Beard S, Lawson H, Hunjan R, Brown D. Mumps outbreaks across England and Wales in 2004: observational study. BMJ. 2005 [accessed 2005 May 31];330(7500):1119–1120. http://bmj.bmjjournals.com/cgi/reprint/330/7500/1119. doi:10.1136/bmj.330.7500.1119.

Author(s). Title of book. Edition. Place of publication: publisher; date of publication [date updated; date accessed]. Notes.

Brogden KA, Guthmille JM, editors. Polymicrobial diseases. Washington (DC): ASM Press; 2002 [accessed February 28, 2014]. http://www.ncbi.nlm.nih.gov/books/NBK2475/.

Author’s name. Title of post [descriptive word]. Title of blog. Date of publication. [accessed date]. URL.

Fogarty M. Formatting titles on Twitter and Facebook [blog]. Grammar Girl: Quick and Dirty Tips for Better Writing. 2012 Aug 14. [accessed 2012 Oct 19]. http://grammar.quickanddirtytips.com/formatting-titles-on-twitter-and-facebook.aspx.

Forthcoming or Unpublished Material

Not all forthcoming or unpublished sources are suitable for inclusion in reference lists. Check with your publisher if in doubt.

Forthcoming journal article or book

Journal article:

Farley T, Galves A, Dickinson LM, Perez MJ. Stress, coping, and health: a comparison of Mexican immigrants, Mexican-Americans, and non-Hispanic whites. J Immigr Health. Forthcoming 2005 Jul.

Goldstein DS. Adrenaline and the inner world: an introduction to scientific integrative medicine. Baltimore (MD): Johns Hopkins University Press. Forthcoming 2006.

Paper or poster presented at meeting

Unpublished presentations are cited as follows:

Antani S, Long LR, Thoma GR, Lee DJ. Anatomical shape representation in spine x-ray images. Paper presented at: VIIP 2003. Proceedings of the 3rd IASTED International Conference on Visualization, Imaging and Image Processing; 2003 Sep 8–10; Benalmadena, Spain.

Charles L, Gordner R. Analysis of MedlinePlus en Español customer service requests. Poster session presented at: Futuro magnifico! Celebrating our diversity. MLA ’05: Medical Library Association Annual Meeting; 2005 May 14–19; San Antonio, TX.

References to published presentations are cited much like contributions to books, with the addition of information about the date and place of the conference. See Chapter 29 for more information.

Personal communication

References to personal communication are placed in running text rather than as formal end references.

Permission is usually required and should be acknowledged in an “Acknowledgment” or “Notes” section at the end of the document.

. . . and most of these meningiomas proved to be inoperable (2003 letter from RS Grant to me; unreferenced, see “Notes”) while a few were not.

Name–Year

The following examples illustrate the name–year system. In this system (sometimes called the Harvard system), in-text references consist of the surname of the author or authors and the year of publication of the document. End references are unnumbered and appear in alphabetical order by author and year of publication, with multiple works by the same author listed in chronological order.

Each example of an end reference is accompanied here by an example of a corresponding in-text reference. For more details and many more examples, see Chapter 29 of Scientific Style and Format .

For the end reference, list authors in the order in which they appear in the original text. The year of publication follows the author list. Use periods to separate each element, including author(s), date of publication, article and journal title, and volume or issue information. Location (usually the page range for the article) is preceded by a colon.

Author(s). Date. Article title. Journal title. Volume(issue):location.

For the in-text reference, use parentheses and list author(s) by surname followed by year of publication.

(Author(s) Year)

For articles with 2 authors, names are separated by a comma in the end reference but by “and” in the in-text reference.

Mazan MR, Hoffman AM. 2001. Effects of aerosolized albuterol on physiologic responses to exercise in standardbreds. Am J Vet Res. 62(11):1812–1817.

(Mazan and Hoffman 2001)

For articles with 3 to 10 authors, list all authors in the end reference; in the in-text reference, list only the first, followed by “et al.”

Smart N, Fang ZY, Marwick TH. 2003. A practical guide to exercise training for heart failure patients. J Card Fail. 9(1):49–58.

(Smart et al. 2003)

For articles with more than 10 authors, list the first 10 in the end reference, followed by “et al.”

Pizzi C, Caraglia M, Cianciulli M, Fabbrocini A, Libroia A, Matano E, Contegiacomo A, Del Prete S, Abbruzzese A, Martignetti A, et al. 2002. Low-dose recombinant IL-2 induces psychological changes: monitoring by Minnesota Multiphasic Personality Inventory (MMPI). Anticancer Res. 22(2A):727–732.

(Pizzi et al. 2002)

Laskowski DA. 2002. Physical and chemical properties of pyrethroids. Rev Environ Contam Toxicol. 174:49–170.

(Laskowski 2002)

Gardos G, Cole JO, Haskell D, Marby D, Paine SS, Moore P. 1988. The natural history of tardive dyskinesia. J Clin Pharmacol. 8(4 Suppl):31S–37S.

(Gardos et al. 1988)

Heemskerk J, Tobin AJ, Ravina B. 2002. From chemical to drug: neurodegeneration drug screening and the ethics of clinical trials. Nat Neurosci. 5 Suppl:1027–1029.

(Heemskerk et al. 2002)

Ramstrom O, Bunyapaiboonsri T, Lohmann S, Lehn JM. 2002. Chemical biology of dynamic combinatorial libraries. Biochim Biophys Acta. 1572(2–3):178–186.

(Ramstrom et al. 2002)

Sabatier R. 1995. Reorienting health and social services. AIDS STD Health Promot Exch. (4):1–3.

(Sabatier 1995)

In the end reference, separate information about author(s), date, title, edition, and publication by periods. The basic format is as follows:

Author(s). Date. Title. Edition. Place of publication: publisher. Extent. Notes.

Extent can include information about pagination or number of volumes and is considered optional. Notes can include information of interest to the reader, such as language of publication other than English; such notes are optional. Essential notes provide information about location, such as a URL for online works. See Chapter 29 for more information.

For books with 2 authors, names are separated by a comma in the end reference but by “and” in the in-text reference.

Leboffe MJ, Pierce BE. 2010. Microbiology: laboratory theory and application. Englewood (CO): Morton Publishing Company.

(Leboffe and Pierce 2010)

For books with 3 to 10 authors, list all authors in the end reference; in the in-text reference, list only the first, followed by “et al.”

Ferrozzi F, Garlaschi G, Bova D. 2000. CT of metastases. New York (NY): Springer.

(Ferrozzi et al. 2000)

For books with more than 10 authors, list the first 10 in the end reference, followed by “et al.”

Wenger NK, Sivarajan Froelicher E, Smith LK, Ades PA, Berra K, Blumenthal JA, Certo CME, Dattilo AM, Davis D, DeBusk RF, et al. 1995. Cardiac rehabilitation. Rockville (MD): Agency for Health Care Policy and Research (US).

(Wenger et al. 1995)

[ALSG] Advanced Life Support Group. 2001. Acute medical emergencies: the practical approach. London (England): BMJ Books.

(ALSG 2001)

Klarsfeld A, Revah F. 2003. The biology of death: origins of mortality. Brady L, translator. Ithaca (NY): Cornell University Press.

Luzikov VN. 1985. Mitochondrial biogenesis and breakdown. Galkin AV, translator; Roodyn DB, editor. New York (NY): Consultants Bureau.

(Klarsfeld and Revah 2003)

(Luzikov 1985)

Gawande A. 2010. The checklist manifesto: how to get things right. New York (NY): Metropolitan Books. Chapter 3, The end of the master builder; p. 48–71.

(Gawande 2010)

Rapley R. 2010. Recombinant DNA and genetic analysis. In: Wilson K, Walker J, editors. Principles and techniques of biochemistry and molecular biology. 7th ed. New York (NY): Cambridge University Press. p. 195–262.

(Rapley 2010)

Alkire LG, editor. 2006. Periodical title abbreviations. 16th ed. Detroit (MI): Thompson Gale. 2 vol. Vol. 1, By abbreviation; vol. 2, By title.

(Alkire 2006)

Lutz M. 1989. 1903: American nervousness and the economy of cultural change [dissertation]. [Stanford (CA)]: Stanford University.

(Lutz 1989)

Blanco EE, Meade JC, Richards WD, inventors; Ophthalmic Ventures, assignee. 1990 Nov 13. Surgical stapling system. United States patent US 4,969,591.

(Blanco et al. 1990)

Weiss R. 2003 Apr 11. Study shows problems in cloning people: researchers find replicating primates will be harder than other mammals. Washington Post (Home Ed.). Sect. A:12 (col. 1).

(Weiss 2003)

Johnson D, editor. c2002. Surgical techniques in orthopaedics: anterior cruciate ligament reconstruction [DVD]. Rosemont (IL): American Academy of Orthopaedic Surgeons. 1 DVD.

(Johnson c2002)

Format for end reference:

Title of Homepage. Date of publication. Edition. Place of publication: publisher; [date updated; date accessed]. Notes.

APSnet: plant pathology online. c1994–2005. St Paul (MN): American Phytopathological Association; [accessed 2005 Jun 20]. http://www.apsnet.org/.

For the in-text reference, include only the first word or two of the title (enough to distinguish it from other titles in the reference list), followed by an ellipsis.

(APSnet . . . c1994–2005)

Author(s) of article. Date of publication. Title of article. Title of journal (edition). [date updated; date accessed];Volume(issue):location. Notes.

Savage E, Ramsay M, White J, Beard S, Lawson H, Hunjan R, Brown D. 2005. Mumps outbreaks across England and Wales in 2004: observational study. BMJ. [accessed 2005 May 31];330(7500):1119–1120. http://bmj.bmjjournals.com/cgi/reprint/330/7500/1119. doi:10.1136/bmj.330.7500.1119.

(Savage et al. 2005)

Author(s). Date of publication. Title of book. Edition. Place of publication: publisher; [date updated; date accessed]. Notes.

Brogden KA, Guthmille JM, editors. 2002. Polymicrobial diseases. Washington (DC): ASM Press; [accessed February 28, 2014]. http://www.ncbi.nlm.nih.gov/books/NBK2475/.

(Brogden and Guthmille 2002)

Author’s name. Date of publication. Title of post [descriptive word]. Title of blog. [accessed date]. URL.

Fogarty M. 2012 Aug 14. Formatting titles on Twitter and Facebook [blog]. Grammar Girl: Quick and Dirty Tips for Better Writing. [accessed 2012 Oct 19]. http://grammar.quickanddirtytips.com/formatting-titles-on-twitter-and-facebook.aspx.

(Fogarty 2012)

Farley T, Galves A, Dickinson LM, Perez MJ. Forthcoming 2005 Jul. Stress, coping, and health: a comparison of Mexican immigrants, Mexican-Americans, and non-Hispanic whites. J Immigr Health.

(Farley et al. 2005)

Goldstein DS. Forthcoming 2006. Adrenaline and the inner world: an introduction to scientific integrative medicine. Baltimore (MD): Johns Hopkins University Press.

(Goldstein 2006)

Antani S, Long LR, Thoma GR, Lee DJ. 2003. Anatomical shape representation in spine x-ray images. Paper presented at: VIIP 2003. Proceedings of the 3rd IASTED International Conference on Visualization, Imaging and Image Processing; Benalmadena, Spain.

Charles L, Gordner R. 2005. Analysis of MedlinePlus en Español customer service requests. Poster session presented at: Futuro magnifico! Celebrating our diversity. MLA ’05: Medical Library Association Annual Meeting; San Antonio, TX.

(Atani et al. 2003)

(Charles and Gordner 2005)

References to personal communication are placed in running text rather than as formal end references. Permission is usually required and should be acknowledged in an “Acknowledgment” or “Notes” section at the end of the document.

Scientific Style and Format, 8th Edition text © 2014 by the Council of Science Editors. Scientific Style and Format Online © 2014 by the Council of Science Editors.

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References in Research – Types, Examples and Writing Guide

Table of Contents

References in Research

Definition:

References in research are a list of sources that a researcher has consulted or cited while conducting their study. They are an essential component of any academic work, including research papers, theses, dissertations, and other scholarly publications.

Types of References

There are several types of references used in research, and the type of reference depends on the source of information being cited. The most common types of references include:

References to books typically include the author’s name, title of the book, publisher, publication date, and place of publication.

Example: Smith, J. (2018). The Art of Writing. Penguin Books.

Journal Articles

References to journal articles usually include the author’s name, title of the article, name of the journal, volume and issue number, page numbers, and publication date.

Example: Johnson, T. (2021). The Impact of Social Media on Mental Health. Journal of Psychology, 32(4), 87-94.

Web sources

References to web sources should include the author or organization responsible for the content, the title of the page, the URL, and the date accessed.

Example: World Health Organization. (2020). Coronavirus disease (COVID-19) advice for the public. Retrieved from https://www.who.int/emergencies/disease/novel-coronavirus-2019/advice-for-public

Conference Proceedings

References to conference proceedings should include the author’s name, title of the paper, name of the conference, location of the conference, date of the conference, and page numbers.

Example: Chen, S., & Li, J. (2019). The Future of AI in Education. Proceedings of the International Conference on Educational Technology, Beijing, China, July 15-17, pp. 67-78.

References to reports typically include the author or organization responsible for the report, title of the report, publication date, and publisher.

Example: United Nations. (2020). The Sustainable Development Goals Report. United Nations.

Formats of References

Some common Formates of References with their examples are as follows:

APA (American Psychological Association) Style

The APA (American Psychological Association) Style has specific guidelines for formatting references used in academic papers, articles, and books. Here are the different reference formats in APA style with examples:

Author, A. A. (Year of publication). Title of book. Publisher.

Example : Smith, J. K. (2005). The psychology of social interaction. Wiley-Blackwell.

Journal Article

Author, A. A., Author, B. B., & Author, C. C. (Year of publication). Title of article. Title of Journal, volume number(issue number), page numbers.

Example : Brown, L. M., Keating, J. G., & Jones, S. M. (2012). The role of social support in coping with stress among African American adolescents. Journal of Research on Adolescence, 22(1), 218-233.

Author, A. A. (Year of publication or last update). Title of page. Website name. URL.

Example : Centers for Disease Control and Prevention. (2020, December 11). COVID-19: How to protect yourself and others. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html

Magazine article

Author, A. A. (Year, Month Day of publication). Title of article. Title of Magazine, volume number(issue number), page numbers.

Example : Smith, M. (2019, March 11). The power of positive thinking. Psychology Today, 52(3), 60-65.

Newspaper article:

Author, A. A. (Year, Month Day of publication). Title of article. Title of Newspaper, page numbers.

Example: Johnson, B. (2021, February 15). New study shows benefits of exercise on mental health. The New York Times, A8.

Edited book

Editor, E. E. (Ed.). (Year of publication). Title of book. Publisher.

Example : Thompson, J. P. (Ed.). (2014). Social work in the 21st century. Sage Publications.

Chapter in an edited book:

Author, A. A. (Year of publication). Title of chapter. In E. E. Editor (Ed.), Title of book (pp. page numbers). Publisher.

Example : Johnson, K. S. (2018). The future of social work: Challenges and opportunities. In J. P. Thompson (Ed.), Social work in the 21st century (pp. 105-118). Sage Publications.

MLA (Modern Language Association) Style

The MLA (Modern Language Association) Style is a widely used style for writing academic papers and essays in the humanities. Here are the different reference formats in MLA style:

Author’s Last name, First name. Title of Book. Publisher, Publication year.

Example : Smith, John. The Psychology of Social Interaction. Wiley-Blackwell, 2005.

Journal article

Author’s Last name, First name. “Title of Article.” Title of Journal, volume number, issue number, Publication year, page numbers.

Example : Brown, Laura M., et al. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence, vol. 22, no. 1, 2012, pp. 218-233.

Author’s Last name, First name. “Title of Webpage.” Website Name, Publication date, URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC, 11 Dec. 2020, https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Publication date, page numbers.

Example : Smith, Mary. “The Power of Positive Thinking.” Psychology Today, Mar. 2019, pp. 60-65.

Newspaper article

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Publication date, page numbers.

Example : Johnson, Bob. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, 15 Feb. 2021, p. A8.

Editor’s Last name, First name, editor. Title of Book. Publisher, Publication year.

Example : Thompson, John P., editor. Social Work in the 21st Century. Sage Publications, 2014.

Chapter in an edited book

Author’s Last name, First name. “Title of Chapter.” Title of Book, edited by Editor’s First Name Last name, Publisher, Publication year, page numbers.

Example : Johnson, Karen S. “The Future of Social Work: Challenges and Opportunities.” Social Work in the 21st Century, edited by John P. Thompson, Sage Publications, 2014, pp. 105-118.

Chicago Manual of Style

The Chicago Manual of Style is a widely used style for writing academic papers, dissertations, and books in the humanities and social sciences. Here are the different reference formats in Chicago style:

Example : Smith, John K. The Psychology of Social Interaction. Wiley-Blackwell, 2005.

Author’s Last name, First name. “Title of Article.” Title of Journal volume number, no. issue number (Publication year): page numbers.

Example : Brown, Laura M., John G. Keating, and Sarah M. Jones. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence 22, no. 1 (2012): 218-233.

Author’s Last name, First name. “Title of Webpage.” Website Name. Publication date. URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC. December 11, 2020. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Publication date.

Example : Smith, Mary. “The Power of Positive Thinking.” Psychology Today, March 2019.

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Publication date.

Example : Johnson, Bob. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Example : Thompson, John P., ed. Social Work in the 21st Century. Sage Publications, 2014.

Author’s Last name, First name. “Title of Chapter.” In Title of Book, edited by Editor’s First Name Last Name, page numbers. Publisher, Publication year.

Example : Johnson, Karen S. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by John P. Thompson, 105-118. Sage Publications, 2014.

Harvard Style

The Harvard Style, also known as the Author-Date System, is a widely used style for writing academic papers and essays in the social sciences. Here are the different reference formats in Harvard Style:

Author’s Last name, First name. Year of publication. Title of Book. Place of publication: Publisher.

Example : Smith, John. 2005. The Psychology of Social Interaction. Oxford: Wiley-Blackwell.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Journal volume number (issue number): page numbers.

Example: Brown, Laura M., John G. Keating, and Sarah M. Jones. 2012. “The Role of Social Support in Coping with Stress among African American Adolescents.” Journal of Research on Adolescence 22 (1): 218-233.

Author’s Last name, First name. Year of publication. “Title of Webpage.” Website Name. URL. Accessed date.

Example : Centers for Disease Control and Prevention. 2020. “COVID-19: How to Protect Yourself and Others.” CDC. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html. Accessed April 1, 2023.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Magazine, month and date of publication.

Example : Smith, Mary. 2019. “The Power of Positive Thinking.” Psychology Today, March 2019.

Author’s Last name, First name. Year of publication. “Title of Article.” Title of Newspaper, month and date of publication.

Example : Johnson, Bob. 2021. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Editor’s Last name, First name, ed. Year of publication. Title of Book. Place of publication: Publisher.

Example : Thompson, John P., ed. 2014. Social Work in the 21st Century. Thousand Oaks, CA: Sage Publications.

Author’s Last name, First name. Year of publication. “Title of Chapter.” In Title of Book, edited by Editor’s First Name Last Name, page numbers. Place of publication: Publisher.

Example : Johnson, Karen S. 2014. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by John P. Thompson, 105-118. Thousand Oaks, CA: Sage Publications.

Vancouver Style

The Vancouver Style, also known as the Uniform Requirements for Manuscripts Submitted to Biomedical Journals, is a widely used style for writing academic papers in the biomedical sciences. Here are the different reference formats in Vancouver Style:

Author’s Last name, First name. Title of Book. Edition number. Place of publication: Publisher; Year of publication.

Example : Smith, John K. The Psychology of Social Interaction. 2nd ed. Oxford: Wiley-Blackwell; 2005.

Author’s Last name, First name. Title of Article. Abbreviated Journal Title. Year of publication; volume number(issue number):page numbers.

Example : Brown LM, Keating JG, Jones SM. The Role of Social Support in Coping with Stress among African American Adolescents. J Res Adolesc. 2012;22(1):218-233.

Author’s Last name, First name. Title of Webpage. Website Name [Internet]. Publication date. [cited date]. Available from: URL.

Example : Centers for Disease Control and Prevention. COVID-19: How to Protect Yourself and Others [Internet]. 2020 Dec 11. [cited 2023 Apr 1]. Available from: https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. Title of Article. Title of Magazine. Year of publication; month and day of publication:page numbers.

Example : Smith M. The Power of Positive Thinking. Psychology Today. 2019 Mar 1:32-35.

Author’s Last name, First name. Title of Article. Title of Newspaper. Year of publication; month and day of publication:page numbers.

Example : Johnson B. New Study Shows Benefits of Exercise on Mental Health. The New York Times. 2021 Feb 15:A4.

Editor’s Last name, First name, editor. Title of Book. Edition number. Place of publication: Publisher; Year of publication.

Example: Thompson JP, editor. Social Work in the 21st Century. 1st ed. Thousand Oaks, CA: Sage Publications; 2014.

Author’s Last name, First name. Title of Chapter. In: Editor’s Last name, First name, editor. Title of Book. Edition number. Place of publication: Publisher; Year of publication. page numbers.

Example : Johnson KS. The Future of Social Work: Challenges and Opportunities. In: Thompson JP, editor. Social Work in the 21st Century. 1st ed. Thousand Oaks, CA: Sage Publications; 2014. p. 105-118.

Turabian Style

Turabian style is a variation of the Chicago style used in academic writing, particularly in the fields of history and humanities. Here are the different reference formats in Turabian style:

Author’s Last name, First name. Title of Book. Place of publication: Publisher, Year of publication.

Example : Smith, John K. The Psychology of Social Interaction. Oxford: Wiley-Blackwell, 2005.

Author’s Last name, First name. “Title of Article.” Title of Journal volume number, no. issue number (Year of publication): page numbers.

Example : Brown, LM, Keating, JG, Jones, SM. “The Role of Social Support in Coping with Stress among African American Adolescents.” J Res Adolesc 22, no. 1 (2012): 218-233.

Author’s Last name, First name. “Title of Webpage.” Name of Website. Publication date. Accessed date. URL.

Example : Centers for Disease Control and Prevention. “COVID-19: How to Protect Yourself and Others.” CDC. December 11, 2020. Accessed April 1, 2023. https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html.

Author’s Last name, First name. “Title of Article.” Title of Magazine, Month Day, Year of publication, page numbers.

Example : Smith, M. “The Power of Positive Thinking.” Psychology Today, March 1, 2019, 32-35.

Author’s Last name, First name. “Title of Article.” Title of Newspaper, Month Day, Year of publication.

Example : Johnson, B. “New Study Shows Benefits of Exercise on Mental Health.” The New York Times, February 15, 2021.

Editor’s Last name, First name, ed. Title of Book. Place of publication: Publisher, Year of publication.

Example : Thompson, JP, ed. Social Work in the 21st Century. Thousand Oaks, CA: Sage Publications, 2014.

Author’s Last name, First name. “Title of Chapter.” In Title of Book, edited by Editor’s Last name, First name, page numbers. Place of publication: Publisher, Year of publication.

Example : Johnson, KS. “The Future of Social Work: Challenges and Opportunities.” In Social Work in the 21st Century, edited by Thompson, JP, 105-118. Thousand Oaks, CA: Sage Publications, 2014.

IEEE (Institute of Electrical and Electronics Engineers) Style

IEEE (Institute of Electrical and Electronics Engineers) style is commonly used in engineering, computer science, and other technical fields. Here are the different reference formats in IEEE style:

Author’s Last name, First name. Book Title. Place of Publication: Publisher, Year of publication.

Example : Oppenheim, A. V., & Schafer, R. W. Discrete-Time Signal Processing. Upper Saddle River, NJ: Prentice Hall, 2010.

Author’s Last name, First name. “Title of Article.” Abbreviated Journal Title, vol. number, no. issue number, pp. page numbers, Month year of publication.

Example: Shannon, C. E. “A Mathematical Theory of Communication.” Bell System Technical Journal, vol. 27, no. 3, pp. 379-423, July 1948.

Conference paper

Author’s Last name, First name. “Title of Paper.” In Title of Conference Proceedings, Place of Conference, Date of Conference, pp. page numbers, Year of publication.

Example: Gupta, S., & Kumar, P. “An Improved System of Linear Discriminant Analysis for Face Recognition.” In Proceedings of the 2011 International Conference on Computer Science and Network Technology, Harbin, China, Dec. 2011, pp. 144-147.

Author’s Last name, First name. “Title of Webpage.” Name of Website. Date of publication or last update. Accessed date. URL.

Example : National Aeronautics and Space Administration. “Apollo 11.” NASA. July 20, 1969. Accessed April 1, 2023. https://www.nasa.gov/mission_pages/apollo/apollo11.html.

Technical report

Author’s Last name, First name. “Title of Report.” Name of Institution or Organization, Report number, Year of publication.

Example : Smith, J. R. “Development of a New Solar Panel Technology.” National Renewable Energy Laboratory, NREL/TP-6A20-51645, 2011.

Author’s Last name, First name. “Title of Patent.” Patent number, Issue date.

Example : Suzuki, H. “Method of Producing Carbon Nanotubes.” US Patent 7,151,019, December 19, 2006.

Standard Title. Standard number, Publication date.

Example : IEEE Standard for Floating-Point Arithmetic. IEEE Std 754-2008, August 29, 2008

ACS (American Chemical Society) Style

ACS (American Chemical Society) style is commonly used in chemistry and related fields. Here are the different reference formats in ACS style:

Author’s Last name, First name; Author’s Last name, First name. Title of Article. Abbreviated Journal Title Year, Volume, Page Numbers.

Example : Wang, Y.; Zhao, X.; Cui, Y.; Ma, Y. Facile Preparation of Fe3O4/graphene Composites Using a Hydrothermal Method for High-Performance Lithium Ion Batteries. ACS Appl. Mater. Interfaces 2012, 4, 2715-2721.

Author’s Last name, First name. Book Title; Publisher: Place of Publication, Year of Publication.

Example : Carey, F. A. Organic Chemistry; McGraw-Hill: New York, 2008.

Author’s Last name, First name. Chapter Title. In Book Title; Editor’s Last name, First name, Ed.; Publisher: Place of Publication, Year of Publication; Volume number, Chapter number, Page Numbers.

Example : Grossman, R. B. Analytical Chemistry of Aerosols. In Aerosol Measurement: Principles, Techniques, and Applications; Baron, P. A.; Willeke, K., Eds.; Wiley-Interscience: New York, 2001; Chapter 10, pp 395-424.

Author’s Last name, First name. Title of Webpage. Website Name, URL (accessed date).

Example : National Institute of Standards and Technology. Atomic Spectra Database. https://www.nist.gov/pml/atomic-spectra-database (accessed April 1, 2023).

Author’s Last name, First name. Patent Number. Patent Date.

Example : Liu, Y.; Huang, H.; Chen, H.; Zhang, W. US Patent 9,999,999, December 31, 2022.

Author’s Last name, First name; Author’s Last name, First name. Title of Article. In Title of Conference Proceedings, Publisher: Place of Publication, Year of Publication; Volume Number, Page Numbers.

Example : Jia, H.; Xu, S.; Wu, Y.; Wu, Z.; Tang, Y.; Huang, X. Fast Adsorption of Organic Pollutants by Graphene Oxide. In Proceedings of the 15th International Conference on Environmental Science and Technology, American Chemical Society: Washington, DC, 2017; Volume 1, pp 223-228.

AMA (American Medical Association) Style

AMA (American Medical Association) style is commonly used in medical and scientific fields. Here are the different reference formats in AMA style:

Author’s Last name, First name. Article Title. Journal Abbreviation. Year; Volume(Issue):Page Numbers.

Example : Jones, R. A.; Smith, B. C. The Role of Vitamin D in Maintaining Bone Health. JAMA. 2019;321(17):1765-1773.

Author’s Last name, First name. Book Title. Edition number. Place of Publication: Publisher; Year.

Example : Guyton, A. C.; Hall, J. E. Textbook of Medical Physiology. 13th ed. Philadelphia, PA: Saunders; 2015.

Author’s Last name, First name. Chapter Title. In: Editor’s Last name, First name, ed. Book Title. Edition number. Place of Publication: Publisher; Year: Page Numbers.

Example: Rajakumar, K. Vitamin D and Bone Health. In: Holick, M. F., ed. Vitamin D: Physiology, Molecular Biology, and Clinical Applications. 2nd ed. New York, NY: Springer; 2010:211-222.

Author’s Last name, First name. Webpage Title. Website Name. URL. Published date. Updated date. Accessed date.

Example : National Cancer Institute. Breast Cancer Prevention (PDQ®)–Patient Version. National Cancer Institute. https://www.cancer.gov/types/breast/patient/breast-prevention-pdq. Published October 11, 2022. Accessed April 1, 2023.

Author’s Last name, First name. Conference presentation title. In: Conference Title; Conference Date; Place of Conference.

Example : Smith, J. R. Vitamin D and Bone Health: A Meta-Analysis. In: Proceedings of the Annual Meeting of the American Society for Bone and Mineral Research; September 20-23, 2022; San Diego, CA.

Thesis or dissertation

Author’s Last name, First name. Title of Thesis or Dissertation. Degree level [Doctoral dissertation or Master’s thesis]. University Name; Year.

Example : Wilson, S. A. The Effects of Vitamin D Supplementation on Bone Health in Postmenopausal Women [Doctoral dissertation]. University of California, Los Angeles; 2018.

ASCE (American Society of Civil Engineers) Style

The ASCE (American Society of Civil Engineers) style is commonly used in civil engineering fields. Here are the different reference formats in ASCE style:

Author’s Last name, First name. “Article Title.” Journal Title, volume number, issue number (year): page numbers. DOI or URL (if available).

Example : Smith, J. R. “Evaluation of the Effectiveness of Sustainable Drainage Systems in Urban Areas.” Journal of Environmental Engineering, vol. 146, no. 3 (2020): 04020010. https://doi.org/10.1061/(ASCE)EE.1943-7870.0001668.

Example : McCuen, R. H. Hydrologic Analysis and Design. 4th ed. Upper Saddle River, NJ: Pearson Education; 2013.

Author’s Last name, First name. “Chapter Title.” In: Editor’s Last name, First name, ed. Book Title. Edition number. Place of Publication: Publisher; Year: page numbers.

Example : Maidment, D. R. “Floodplain Management in the United States.” In: Shroder, J. F., ed. Treatise on Geomorphology. San Diego, CA: Academic Press; 2013: 447-460.

Author’s Last name, First name. “Paper Title.” In: Conference Title; Conference Date; Location. Place of Publication: Publisher; Year: page numbers.

Example: Smith, J. R. “Sustainable Drainage Systems for Urban Areas.” In: Proceedings of the ASCE International Conference on Sustainable Infrastructure; November 6-9, 2019; Los Angeles, CA. Reston, VA: American Society of Civil Engineers; 2019: 156-163.

Author’s Last name, First name. “Report Title.” Report number. Place of Publication: Publisher; Year.

Example : U.S. Army Corps of Engineers. “Hurricane Sandy Coastal Risk Reduction Program, New York and New Jersey.” Report No. P-15-001. Washington, DC: U.S. Army Corps of Engineers; 2015.

CSE (Council of Science Editors) Style

The CSE (Council of Science Editors) style is commonly used in the scientific and medical fields. Here are the different reference formats in CSE style:

Author’s Last name, First Initial. Middle Initial. “Article Title.” Journal Title. Year;Volume(Issue):Page numbers.

Example : Smith, J.R. “Evaluation of the Effectiveness of Sustainable Drainage Systems in Urban Areas.” Journal of Environmental Engineering. 2020;146(3):04020010.

Author’s Last name, First Initial. Middle Initial. Book Title. Edition number. Place of Publication: Publisher; Year.

Author’s Last name, First Initial. Middle Initial. “Chapter Title.” In: Editor’s Last name, First Initial. Middle Initial., ed. Book Title. Edition number. Place of Publication: Publisher; Year:Page numbers.

Author’s Last name, First Initial. Middle Initial. “Paper Title.” In: Conference Title; Conference Date; Location. Place of Publication: Publisher; Year.

Example : Smith, J.R. “Sustainable Drainage Systems for Urban Areas.” In: Proceedings of the ASCE International Conference on Sustainable Infrastructure; November 6-9, 2019; Los Angeles, CA. Reston, VA: American Society of Civil Engineers; 2019.

Author’s Last name, First Initial. Middle Initial. “Report Title.” Report number. Place of Publication: Publisher; Year.

Bluebook Style

The Bluebook style is commonly used in the legal field for citing legal documents and sources. Here are the different reference formats in Bluebook style:

Case citation

Case name, volume source page (Court year).

Example : Brown v. Board of Education, 347 U.S. 483 (1954).

Statute citation

Name of Act, volume source § section number (year).

Example : Clean Air Act, 42 U.S.C. § 7401 (1963).

Regulation citation

Name of regulation, volume source § section number (year).

Example: Clean Air Act, 40 C.F.R. § 52.01 (2019).

Book citation

Author’s Last name, First Initial. Middle Initial. Book Title. Edition number (if applicable). Place of Publication: Publisher; Year.

Example: Smith, J.R. Legal Writing and Analysis. 3rd ed. New York, NY: Aspen Publishers; 2015.

Journal article citation

Author’s Last name, First Initial. Middle Initial. “Article Title.” Journal Title. Volume number (year): first page-last page.

Example: Garcia, C. “The Right to Counsel: An International Comparison.” International Journal of Legal Information. 43 (2015): 63-94.

Website citation

Author’s Last name, First Initial. Middle Initial. “Page Title.” Website Title. URL (accessed month day, year).

Example : United Nations. “Universal Declaration of Human Rights.” United Nations. https://www.un.org/en/universal-declaration-human-rights/ (accessed January 3, 2023).

Oxford Style

The Oxford style, also known as the Oxford referencing system or the documentary-note citation system, is commonly used in the humanities, including literature, history, and philosophy. Here are the different reference formats in Oxford style:

Author’s Last name, First name. Book Title. Place of Publication: Publisher, Year of Publication.

Example : Smith, John. The Art of Writing. New York: Penguin, 2020.

Author’s Last name, First name. “Article Title.” Journal Title volume, no. issue (year): page range.

Example: Garcia, Carlos. “The Role of Ethics in Philosophy.” Philosophy Today 67, no. 3 (2019): 53-68.

Chapter in an edited book citation

Author’s Last name, First name. “Chapter Title.” In Book Title, edited by Editor’s Name, page range. Place of Publication: Publisher, Year of Publication.

Example : Lee, Mary. “Feminism in the 21st Century.” In The Oxford Handbook of Feminism, edited by Jane Smith, 51-69. Oxford: Oxford University Press, 2018.

Author’s Last name, First name. “Page Title.” Website Title. URL (accessed day month year).

Example : Jones, David. “The Importance of Learning Languages.” Oxford Language Center. https://www.oxfordlanguagecenter.com/importance-of-learning-languages/ (accessed 3 January 2023).

Dissertation or thesis citation

Author’s Last name, First name. “Title of Dissertation/Thesis.” PhD diss., University Name, Year of Publication.

Example : Brown, Susan. “The Art of Storytelling in American Literature.” PhD diss., University of Oxford, 2020.

Newspaper article citation

Author’s Last name, First name. “Article Title.” Newspaper Title, Month Day, Year.

Example : Robinson, Andrew. “New Developments in Climate Change Research.” The Guardian, September 15, 2022.

AAA (American Anthropological Association) Style

The American Anthropological Association (AAA) style is commonly used in anthropology research papers and journals. Here are the different reference formats in AAA style:

Author’s Last name, First name. Year of Publication. Book Title. Place of Publication: Publisher.

Example : Smith, John. 2019. The Anthropology of Food. New York: Routledge.

Author’s Last name, First name. Year of Publication. “Article Title.” Journal Title volume, no. issue: page range.

Example : Garcia, Carlos. 2021. “The Role of Ethics in Anthropology.” American Anthropologist 123, no. 2: 237-251.

Author’s Last name, First name. Year of Publication. “Chapter Title.” In Book Title, edited by Editor’s Name, page range. Place of Publication: Publisher.

Example: Lee, Mary. 2018. “Feminism in Anthropology.” In The Oxford Handbook of Feminism, edited by Jane Smith, 51-69. Oxford: Oxford University Press.

Author’s Last name, First name. Year of Publication. “Page Title.” Website Title. URL (accessed day month year).

Example : Jones, David. 2020. “The Importance of Learning Languages.” Oxford Language Center. https://www.oxfordlanguagecenter.com/importance-of-learning-languages/ (accessed January 3, 2023).

Author’s Last name, First name. Year of Publication. “Title of Dissertation/Thesis.” PhD diss., University Name.

Example : Brown, Susan. 2022. “The Art of Storytelling in Anthropology.” PhD diss., University of California, Berkeley.

Author’s Last name, First name. Year of Publication. “Article Title.” Newspaper Title, Month Day.

Example : Robinson, Andrew. 2021. “New Developments in Anthropology Research.” The Guardian, September 15.

AIP (American Institute of Physics) Style

The American Institute of Physics (AIP) style is commonly used in physics research papers and journals. Here are the different reference formats in AIP style:

Example : Johnson, S. D. 2021. “Quantum Computing and Information.” Journal of Applied Physics 129, no. 4: 043102.

Example : Feynman, Richard. 2018. The Feynman Lectures on Physics. New York: Basic Books.

Example : Jones, David. 2020. “The Future of Quantum Computing.” In The Handbook of Physics, edited by John Smith, 125-136. Oxford: Oxford University Press.

Conference proceedings citation

Author’s Last name, First name. Year of Publication. “Title of Paper.” Proceedings of Conference Name, date and location: page range. Place of Publication: Publisher.

Example : Chen, Wei. 2019. “The Applications of Nanotechnology in Solar Cells.” Proceedings of the 8th International Conference on Nanotechnology, July 15-17, Tokyo, Japan: 224-229. New York: AIP Publishing.

Example : American Institute of Physics. 2022. “About AIP Publishing.” AIP Publishing. https://publishing.aip.org/about-aip-publishing/ (accessed January 3, 2023).

Patent citation

Author’s Last name, First name. Year of Publication. Patent Number.

Example : Smith, John. 2018. US Patent 9,873,644.

References Writing Guide

Here are some general guidelines for writing references:

• Follow the citation style guidelines: Different disciplines and journals may require different citation styles (e.g., APA, MLA, Chicago). It is important to follow the specific guidelines for the citation style required.
• Include all necessary information : Each citation should include enough information for readers to locate the source. For example, a journal article citation should include the author(s), title of the article, journal title, volume number, issue number, page numbers, and publication year.
• Use proper formatting: Citation styles typically have specific formatting requirements for different types of sources. Make sure to follow the proper formatting for each citation.
• Order citations alphabetically: If listing multiple sources, they should be listed alphabetically by the author’s last name.
• Be consistent: Use the same citation style throughout the entire paper or project.
• Check for accuracy: Double-check all citations to ensure accuracy, including correct spelling of author names and publication information.
• Use reputable sources: When selecting sources to cite, choose reputable and authoritative sources. Avoid sources that are biased or unreliable.
• Include all sources: Make sure to include all sources used in the research, including those that were not directly quoted but still informed the work.
• Use online tools : There are online tools available (e.g., citation generators) that can help with formatting and organizing references.

Purpose of References in Research

References in research serve several purposes:

• To give credit to the original authors or sources of information used in the research. It is important to acknowledge the work of others and avoid plagiarism.
• To provide evidence for the claims made in the research. References can support the arguments, hypotheses, or conclusions presented in the research by citing relevant studies, data, or theories.
• To allow readers to find and verify the sources used in the research. References provide the necessary information for readers to locate and access the sources cited in the research, which allows them to evaluate the quality and reliability of the information presented.
• To situate the research within the broader context of the field. References can show how the research builds on or contributes to the existing body of knowledge, and can help readers to identify gaps in the literature that the research seeks to address.

Importance of References in Research

References play an important role in research for several reasons:

• Credibility : By citing authoritative sources, references lend credibility to the research and its claims. They provide evidence that the research is based on a sound foundation of knowledge and has been carefully researched.
• Avoidance of Plagiarism : References help researchers avoid plagiarism by giving credit to the original authors or sources of information. This is important for ethical reasons and also to avoid legal repercussions.
• Reproducibility : References allow others to reproduce the research by providing detailed information on the sources used. This is important for verification of the research and for others to build on the work.
• Context : References provide context for the research by situating it within the broader body of knowledge in the field. They help researchers to understand where their work fits in and how it builds on or contributes to existing knowledge.
• Evaluation : References provide a means for others to evaluate the research by allowing them to assess the quality and reliability of the sources used.

Advantages of References in Research

There are several advantages of including references in research:

• Acknowledgment of Sources: Including references gives credit to the authors or sources of information used in the research. This is important to acknowledge the original work and avoid plagiarism.
• Evidence and Support : References can provide evidence to support the arguments, hypotheses, or conclusions presented in the research. This can add credibility and strength to the research.
• Reproducibility : References provide the necessary information for others to reproduce the research. This is important for the verification of the research and for others to build on the work.
• Context : References can help to situate the research within the broader body of knowledge in the field. This helps researchers to understand where their work fits in and how it builds on or contributes to existing knowledge.
• Evaluation : Including references allows others to evaluate the research by providing a means to assess the quality and reliability of the sources used.
• Ongoing Conversation: References allow researchers to engage in ongoing conversations and debates within their fields. They can show how the research builds on or contributes to the existing body of knowledge.

About the author

Muhammad Hassan

Researcher, Academic Writer, Web developer

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Table of Contents

Every scientific paper builds on previous research – even if it’s in a new field, related studies will have preceded and informed it. In peer-reviewed articles, authors must give credit to this previous research, through citations and references. Not only does this show clearly where the current research came from, but it also helps readers understand the content of the paper better.

There is no optimum number of references for an academic article but depending on the subject you could be dealing with more than 100 different papers, conference reports, video articles, medical guidelines or any number of other resources.

That’s a lot of content to manage. Before submitting your manuscript, this needs to be checked, cross-references in the text and the list, organized and formatted.

The exact content and format of the citations and references in your paper will depend on the journal you aim to publish in, so the first step is to check the journal’s Guide for Authors before you submit.

There are two main points to pay attention to – consistency and accuracy. When you go through your manuscript to edit or proofread it, look closely at the citations within the text. Are they all the same? For example, if the journal prefers the citations to be in the format (name, year), make sure they’re all the same: (Smith, 2016).

Your citations must also be accurate and complete. Do they match your references list? Each citation should be included in the list, so cross-checking is important. It’s also common for journals to prefer that most, if not all, of the articles listed in your references be cited within the text – after all, these should be studies that contributed to the knowledge underpinning your work, not just your bedtime reading. So go through them carefully, noting any missing references or citations and filling the gaps.

Each journal has its own requirements when it comes to the content and format of references, as well as where and how you should include them in your submission, so double-check before you hit send!

In general, a reference will include authors’ names and initials, the title of the article, name of the journal, volume and issue, date, page numbers and DOI. On ScienceDirect, articles are linked to their original source (if also published on ScienceDirect) or to their Scopus record, so including the DOI can help link to the correct article.

A spotless reference list

Luckily, compiling and editing the references in your scientific manuscript can be easy – and it no longer has to be manual. Management tools like Mendeley can keep track of all your references, letting you share them with your collaborators. With the Word plugin, it’s possible to select the right citation style for the journal you’re submitting to and the tool will format your references automatically.

Like with any other part of your manuscript, it’s important to make sure your reference list has been checked and edited. Elsevier Author Services Language Editing can help, with professional manuscript editing that will help make sure your references don’t hold you back from publication.

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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 .

You can use the interactive example generator to explore the format for APA and MLA journal article citations.

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Table of contents

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.
• MLA style is the second most popular, used mainly in the humanities.
• Chicago notes and bibliography style is also popular in the humanities, especially history.
• 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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A Quick Guide to Referencing | Cite Your Sources Correctly

Referencing means acknowledging the sources you have used in your writing. Including references helps you support your claims and ensures that you avoid plagiarism .

There are many referencing styles, but they usually consist of two things:

• A citation wherever you refer to a source in your text.
• A reference list or bibliography at the end listing full details of all your sources.

The most common method of referencing in UK universities is Harvard style , which uses author-date citations in the text. Our free Harvard Reference Generator automatically creates accurate references in this style.

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Table of contents

Referencing styles, citing your sources with in-text citations, creating your reference list or bibliography, harvard referencing examples, frequently asked questions about referencing.

Each referencing style has different rules for presenting source information. For in-text citations, some use footnotes or endnotes , while others include the author’s surname and date of publication in brackets in the text.

The reference list or bibliography is presented differently in each style, with different rules for things like capitalisation, italics, and quotation marks in references.

Your university will usually tell you which referencing style to use; they may even have their own unique style. Always follow your university’s guidelines, and ask your tutor if you are unsure. The most common styles are summarised below.

Harvard referencing, the most commonly used style at UK universities, uses author–date in-text citations corresponding to an alphabetical bibliography or reference list at the end.

Harvard Referencing Guide

Vancouver referencing, used in biomedicine and other sciences, uses reference numbers in the text corresponding to a numbered reference list at the end.

Vancouver Referencing Guide

APA referencing, used in the social and behavioural sciences, uses author–date in-text citations corresponding to an alphabetical reference list at the end.

APA Referencing Guide APA Reference Generator

MHRA referencing, used in the humanities, uses footnotes in the text with source information, in addition to an alphabetised bibliography at the end.

MHRA Referencing Guide

OSCOLA referencing, used in law, uses footnotes in the text with source information, and an alphabetical bibliography at the end in longer texts.

OSCOLA Referencing Guide

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In-text citations should be used whenever you quote, paraphrase, or refer to information from a source (e.g. a book, article, image, website, or video).

Quoting and paraphrasing

Quoting is when you directly copy some text from a source and enclose it in quotation marks to indicate that it is not your own writing.

Paraphrasing is when you rephrase the original source into your own words. In this case, you don’t use quotation marks, but you still need to include a citation.

In most referencing styles, page numbers are included when you’re quoting or paraphrasing a particular passage. If you are referring to the text as a whole, no page number is needed.

In-text citations

In-text citations are quick references to your sources. In Harvard referencing, you use the author’s surname and the date of publication in brackets.

Up to three authors are included in a Harvard in-text citation. If the source has more than three authors, include the first author followed by ‘ et al. ‘

The point of these citations is to direct your reader to the alphabetised reference list, where you give full information about each source. For example, to find the source cited above, the reader would look under ‘J’ in your reference list to find the title and publication details of the source.

Placement of in-text citations

In-text citations should be placed directly after the quotation or information they refer to, usually before a comma or full stop. If a sentence is supported by multiple sources, you can combine them in one set of brackets, separated by a semicolon.

If you mention the author’s name in the text already, you don’t include it in the citation, and you can place the citation immediately after the name.

• Another researcher warns that the results of this method are ‘inconsistent’ (Singh, 2018, p. 13) .
• Previous research has frequently illustrated the pitfalls of this method (Singh, 2018; Jones, 2016) .
• Singh (2018, p. 13) warns that the results of this method are ‘inconsistent’.

The terms ‘bibliography’ and ‘reference list’ are sometimes used interchangeably. Both refer to a list that contains full information on all the sources cited in your text. Sometimes ‘bibliography’ is used to mean a more extensive list, also containing sources that you consulted but did not cite in the text.

A reference list or bibliography is usually mandatory, since in-text citations typically don’t provide full source information. For styles that already include full source information in footnotes (e.g. OSCOLA and Chicago Style ), the bibliography is optional, although your university may still require you to include one.

Format of the reference list

Reference lists are usually alphabetised by authors’ last names. Each entry in the list appears on a new line, and a hanging indent is applied if an entry extends onto multiple lines.

Different source information is included for different source types. Each style provides detailed guidelines for exactly what information should be included and how it should be presented.

Below are some examples of reference list entries for common source types in Harvard style.

• Chapter of a book
• Journal article

Your university should tell you which referencing style to follow. If you’re unsure, check with a supervisor. Commonly used styles include:

• Harvard referencing , the most commonly used style in UK universities.
• MHRA , used in humanities subjects.
• APA , used in the social sciences.
• Vancouver , used in biomedicine.
• OSCOLA , used in law.

Your university may have its own referencing style guide.

If you are allowed to choose which style to follow, we recommend Harvard referencing, as it is a straightforward and widely used style.

References should be included in your text whenever you use words, ideas, or information from a source. A source can be anything from a book or journal article to a website or YouTube video.

If you don’t acknowledge your sources, you can get in trouble for plagiarism .

To avoid plagiarism , always include a reference when you use words, ideas or information from a source. This shows that you are not trying to pass the work of others off as your own.

You must also properly quote or paraphrase the source. If you’re not sure whether you’ve done this correctly, you can use the Scribbr Plagiarism Checker to find and correct any mistakes.

Harvard referencing uses an author–date system. Sources are cited by the author’s last name and the publication year in brackets. Each Harvard in-text citation corresponds to an entry in the alphabetised reference list at the end of the paper.

Vancouver referencing uses a numerical system. Sources are cited by a number in parentheses or superscript. Each number corresponds to a full reference at the end of the paper.

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• v.53(3); May-Jun 2019

Formatting References for Scientific Manuscripts

Srinivas b s kambhampati.

Sri Dhaatri Orthopaedic, Maternity and Gynaecology Center, Vijayawada, Andhra Pradesh, India

Lalit Maini

1 Department of Orthopaedics, Maulana Azad Medical College, New Delhi, India

While references are an essential and integral part of a scientific manuscript, format and style of references are as varied as the number of journals currently present. International Committee of Medical Journal Editors in their latest recommendations for publication, 1 advice authors to quote original references whenever possible. We would recommend the readers to go through these guidelines as they are given in sufficient detail to submit a good set of references including styling. Other resources for citing references include the PubMed section 2 which gives samples of formatting of different reference types and the eBook: Citing Medicine, 3 published by the U. S. National Library of Medicine, which gives assistance and rules to authors, editors, publishers and librarians for formatting of references for different reference types.

References are formatted in two basic styles – the Vancouver style which is numeric (more commonly used in medical journals) and Harvard which uses author-date style (more commonly used in natural and Social sciences journals). 4 Parts and order of the parts cited differ on what the author is citing (reference type) and the journal that is being submitted to. The most common types of references include journal article, book, book section or chapter, dissertation, monograph, and webpage. As an example, for a journal article, the parts of a reference in the sequence include authors, article title, journal title, date of publication, volume, issue, and location/pagination. Each journal has its own modification of the format for each part and the punctuation marks, or their lack of, between the parts. Formatting style in each part of a reference could involve placement of selected punctuation marks, bold and italics enhancements, alphabetical order or sequential ordering of references and style of citing in the text, making the combination of variations that create a unique reference style as large in number as the number of journals currently published. It is not clear why such a system has evolved, but it requires considerable attention to detail to get the formatting correct and is time-consuming for the author. The tradition of the journal has been thought as one of the reasons. 4 In manuscripts submitted for the Indian Journal of Orthopaedics (IJO), the reference section carries the most formatting errors committed by authors.

The advantage of having a constant style within a journal is two-fold, apart from an esthetic appearance of references across all articles published by the journal. Ease of reading the references at the end of each article and ease of finding reference part by the reader if he/she is used to the format and plans to look up the reference. As a student/professional in the medical field, one would require attention to finer details of his/her research work as well as in their clinical practice and hence exercising attention to the references would help improve those skills. Such a wide variation in the styles of references has also benefitted some software companies who deal with reference managers (RMs). Some RMs are free for use, and the authors are advised to use different RMs to see which one suits their needs best. While some RMs are cloud based, others are computer based and do not require an internet connection while some others are cloud and computer based. The variation in the style of references across journals appears unlikely to be standardized to a single universal format in the near future.

The Citation Style Language (CSL) is an XML-based computer language developed to standardize formatting of citations and references in manuscripts submitting to journals. They are text application editable files which are imported into RMs. An increasing number of RMs use CSL to help users format their list of references according to individual journal guidelines. However, not all journals are supported by CSL files.

There are two main repositories for access to CSL files – One by GitHub 5 and the other by Zotero 6 developed by Corporation for Digital Scholarship and Roy Rosenzweig Center for History and New Media. These contain more than 8500 styles of references. Authors using Zotero, Mendeley, RefWorks, Papers, CrossRef, Bibliography, and some 42 other RMs can use these CSL files to manage references within them. IJO did not have a CSL file until now in both the repositories. In this scenario, there are a few options for the authors preparing references for a manuscript. First, to type and style references manually which would take a long time and prone to human errors. Second, a CSL file similar to IJO may be selected from the repository and used and later manually edited, if any needed. However, this involves searching for an exact match of style for a journal registered in the repository of CSL files. Third, there are RMs with inbuilt options to format references while citing in the text. This option is independent of CSL. The disadvantage here is that the author is bound by the list of reference styles already loaded within the software. They may not be able to add new formats. Fourth, some RMs allow authors to prepare a style, but this would take some time to prepare if the style is not already inbuilt. As a fifth option, a CSL file that is close to IJO may be chosen, and the code of this file tweaked with minor editing to convert it for use with IJO. To do that, the author must be familiar with programming or editing of HTML/XML files since HTML is a language that is closer to XML.

Zotero's repository 7 website has a user-friendly interface in which such searches are easier to perform. It has 9357 styles stored in the repository at the time of writing this article on March 17, 2019. There are 1924 unique styles through which one can search if their required journal is listed. Zotero draws CSL files from GitHub into their repository. Hence, if a file is created in GitHub, it is drawn into Zotero by default. CSL Project 8 is a website sponsored by four well known RMs. These are Zotero, Mendeley, 9 Papers, 10 and RefWorks. 11 This website gives detailed specifications and documentation of CSL language if one is interested in coding these files. If one is proficient with XML, they can create a style and submit it to the GitHub website for others to benefit. Editing is easier if one uses the Zotero RM as it has an inbuilt option to edit style. It can be done even in other managers or with the use of a standard text editing application in Windows or Mac operating systems. Once a new CSL file is developed, in order to publish it, it has to be validated by CSL validator website 12 and submitted at the GitHub site for accepting into the repository. Even finer details like number of author names before et al. while formatting reference, punctuation marks and their placement, style of each part of the reference and each style of the reference, etc., can be edited accurately.

Once developed, the output of references and citations is remarkably consistent, and too much time need not be directed to editing the punctuation marks and styling of the references and citations while preparing the manuscript. The only hurdle after this would be to get full details of the references reliably and accurately into the RM database while importing the references. The author needs to check that the references were properly imported into the database. If verified, they may be used any number of times with precision. With appropriate selection, the citing as well as the list of references can be formatted according to the journal that is being considered, for submission. Those who are already using RMs may be well aware of the advantages and the time such CSL files can save while preparing a manuscript.

We are happy to inform that a CSL file for IJO has now been created in the GitHub repository 1 and Zotero Styles repository 3 and it can be used by authors using the RMs listed in the CSL website and benefit from its use. The direct link of the file in the repository is given 13 [ Figure 1 ]. Basic users of RMs may download it through their RMs by selecting Indian Journal of Orthopaedics option. Advanced users who know where to place this file may access using the weblink given. Examples of reference style and citation for IJO are given in Figure 2 .

Screenshot of browser shows the web address and search words used to retrieve Citation Style Language file for Indian Journal of Orthopaedics

Examples of format of references and their citation in text for the Indian Journal of Orthopaedics

References: How to Cite and List Correctly

• First Online: 25 February 2021

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• C. George Thomas 2  

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When we write an essay, research paper, thesis, or book, it is normal to include information from the work of others or support our arguments by reference to other published works. All such academic documents draw heavily on the ideas and findings of previous and current researchers available through various sources such as books, journals, theses, newspapers, magazines, government reports, or Internet sources. In all these cases, proper referencing is essential in order to ensure easy retrieval of information. Referencing is the name given to the method of showing and acknowledging the sources from which the author has obtained ideas or information.

Everything deep is also simple and can be reproduced simply as long as its reference to the whole truth is maintained. But what matters is not what is witty but what is true. Albert Schweitzer (1875–1965)

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Thomas, C.G. (2021). References: How to Cite and List Correctly. In: Research Methodology and Scientific Writing . Springer, Cham. https://doi.org/10.1007/978-3-030-64865-7_15

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When you use ideas that are not your own, it is important to credit or cite the author(s) or source, even if you do not quote their idea or words exactly as written. Citing your sources allows your reader to identify the works you have consulted and to understand the scope of your research. There are many different citation styles available. You may be required to use a particular style or you may choose one.

One of the commonly used styles is the APA (American Psychological Association) Style.

APA style stipulates that authors use brief references in the text of a work with full bibliographic details supplied in a Reference List (typically at the end of your document). In text, the reference is very brief and usually consists simply of the author's last name and a date.For example:

...Sheep milk has been proved to contain more nutrients than cow milk (Johnson, 2005).

In a Reference list, the reference contains full bibliographic details written in a format that depends on the type of reference. Examples of formats for some common types of references are listed below. For additional information, visit the University of Arkansas libraries webpage on citing your sources . Another useful web-site on this topic is here.

Author last name, Author First Initial. Author Second Initial. (Publication Year). Title of article. Title of Journal, volume(issue) (if issue numbered), pages.

Bass, M. A., Enochs, W. K., & DiBrezzo, R. (2002). Comparison of two exercise programs on general well-being of college students. Psychological Reports, 91(3), 1195-1201.

Author Last Name, Author First Initial. Author Second Initial. (if there is no author move entry title to first position) (Publication year). Title of article or entry. In Work title. (Vol. number, pp. pages). Place: Publisher.

"Ivory-billed woodpecker." (2002). In The new encyclopædia britannica. (Vol. 5, p. ). 15th ed. Chicago: Encyclopædia Britannica.

Author Last Name, Author First Initial. Author Second Initial. (if there is no author move entry title to first position) (Publication year). Title of article or entry. In Work title. Retrieved from (database name or URL).

Ivory-billed woodpecker. (2006). In Encyclopædia britannica online. Retrieved from http://search.eb.com/eb/article-9043081

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Holloway, M. (2005, August). When extinct isn't. Scientific American, 293, 22-23.

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Holloway, M. (2005, August). When extinct isn't. Scientific American, 293, 22-23. Retrieved from Academic Search Premier database.

Page Author Last Name, Page Author First Initial. Page Author Second Initial. Page title [nature of work - web site, blog, forum posting, etc.]. (Publication Year). Retrieved from (URL)

Sabo, G., et al. Rock art in Arkansas [Web site]. (2001). Retrieved from http://arkarcheology.uark.edu/rockart/index.html

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How To Write References for Academic & Scientific Research Papers

How To Write References for Academic and Scientific Research Papers Writing accurate & appropriate references is an essential aspect of preparing a research paper for successful publication, examination or any other kind of serious dissemination or evaluation. This article explains exactly how to write perfect references in two widely used scholarly styles: the parenthetical author–date system recommended by the American Psychological Association (APA) & the sequential numerical or Vancouver system frequently used in the sciences. The post also includes several clear examples of in-text citations & complete bibliographical references formatted in both styles. Neither of these documentation styles is inherently complex, though each does have its characteristic pitfalls, and the utmost accuracy is essential when using either. Accusations of plagiarism or misrepresentation of the work of other scholars can be the unpleasant result if authors are not absolutely correct and scrupulously thorough in providing citations and references when they should to acknowledge the research of others. In addition, publication attempts can prove unsuccessful and grades lower than expected if instructions and guidelines for references are not observed with precision and consistency. The discussion and examples offered below outline exactly how to provide scholarly references for articles and books in one version of an author–date documentation style – APA – and one of a numerical style – Vancouver – but do be aware that various versions of these two basic styles exist, so consulting the guidelines, instructions or manual specific to the research paper you are writing is always imperative before finalising formats for in-text citations and complete references. PhD Thesis Editing Services Writing APA Author–Date References for a Research Paper Writing an accurate and appropriate APA author–date reference is a two-stage process involving 1) the creation of an in-text citation in the main body of the paper and 2) the addition of a complete bibliographical entry about the source in a list of references at the end of the paper.

1. The in-text citation should contain the last name of the author (or last names of the authors if there is more than one) who wrote the article, book or other document followed by the document’s date of publication. This information most frequently appears in parentheses immediately after the statement related to the paper, as in this example: • A recent study of the text presents a similar argument (Wilson & Bond, 2016). Alternatively, the names of the authors or the date of publication can be integrated into the main text, with the remaining information presented in parentheses: • Wilson and Bond present a similar argument in their recent study of the text (2016). • A 2016 examination of the text presents a similar argument (Wilson & Bond). Rewording of the main text is obviously necessary, but the only difference (beyond arrangement) in the citation information itself is that the word ‘and’ is used between the author names in the main text, whereas an ampersand (&) is used between those names when they appear in parentheses. The parentheses can sometimes be eliminated altogether by writing both author names and publication date in the main text: • Wilson and Bond’s 2016 study of the text presents a similar argument. Page numbers can be used for referring to specific information in particular parts of a publication, but they are usually only required in APA style for direct quotations when a passage or other part of a published document is reproduced word for word in a new research paper. In such cases, the page number is separated from the publication date by a comma and preceded by the abbreviation ‘p.’ for ‘page’: • As Wilson and Bond explain, ‘the political reading of the text, even the most personal of its episodes, seems universal until the book falls into a woman’s hands’ (2016, p.88).

When two or more sources are cited in the same set of parentheses, semicolons are used to separate the sources: • Both studies consider the poem in relation to urban culture (Samuel & Watson, 2013; Wilson & Bond, 2016). The normal arrangement when multiple sources are cited in a single set of parentheses is to observe alphabetical order according to the author names, as I have done above (with ‘Samuel’ preceding ‘Wilson’). Notice that the in-text citation takes the same form whether the source cited is a book or an article, with ‘Samuel & Watson’ referring here to a monograph and ‘Wilson & Bond’ to a journal article. PhD Thesis Editing Services 2. Every source cited in the text of an academic or scientific research paper using APA style should also be included in a list that is entitled ‘References’ and presented at the end of the paper. An APA list of references should be arranged alphabetically based on author names, and all the bibliographical information required for readers to find each source must be provided in a specific format. The author names for a publication come first and are inverted, with the last name of the first author of each document opening the bibliographical entry. Author names are followed by the date of publication (in parentheses), with these two pieces of information serving readers by connecting the complete reference to the in-text citation. It is therefore vital that the last names of authors and the publication dates provided in both places are checked against each other for errors and inconsistencies and then carefully corrected to agree with precision.

For the complete reference to a journal article, the title of the article follows the date of publication. The name and volume number of the journal come next, both of them in italic font, though do be aware that special fonts may not be displayed in this post. The pages on which the article can be found come next, and if there is a doi or url for an online version of the paper, that should be the last item in the entry, which would take this form: • Wilson, S., & Bond, F. (2016). Political and personal readings of the earliest zone poem. Urban Poetry, 12, 72–94. doi:00.0000/00000000000000 For the complete reference to a book, the information, and thus the format, is a little different. The title of the book follows the publication date and appears in italic font, with the place of publication and publisher’s name completing the reference: • Samuel, H., & Watson, M. (2013). Political poetry and modern urbanity. London: Big City Press.

Writing Sequential Numerical References for a Research Paper The same two-step process is necessary when writing the sequential numerical references used for Vancouver style documentation, but in-text citations are notably simpler, a different arrangement is used for the list of references and a somewhat different format is required for the complete bibliographical entries included in the list.

1. For a numerical in-text citation, a single Arabic numeral is all that is required. Each source is assigned a number when it is first cited, so the sources used in a research paper are numbered sequentially according to the order of first citation, with each source retaining throughout the paper the number it was originally assigned. The first source cited would therefore be reference 1, the second reference 2 and so on. The International Committee of Medical Journal Editors (ICMJE) recommends placing these reference numbers in parentheses, with a citation taking this form: • A recent study of the text presents a similar argument (1). As is the case with author–date citations, information about sources can also be added in the main text: • Wilson and Bond present a similar argument in their recent study of the text (1). • A 2016 examination of the text presents a similar argument (1). • Wilson and Bond’s 2016 study of the text presents a similar argument (1). Unlike author–date citations, however, this additional information in the text does not negate the need for the reference number, which is always required.

If you need to cite a specific page of a document to point readers to a particular piece of information or indicate the location of a quoted passage, the page number should be added after the reference number, usually with a comma to separate it from the reference number and a preceding ‘p.’ to avoid confusion: • As Wilson and Bond explain, ‘the political reading of the text, even the most personal of its episodes, seems universal until the book falls into a woman’s hands’ (1, p.88). When two or more sources are cited at the same time, commas are generally used to separate the reference numbers, usually without intervening spaces: • Several studies have taken this approach to the text (1,2,5–8). PhD Thesis Editing Services 2. The reference list for sequential numerical citations is arranged, not surprisingly, by the numerical sequence of the citations. This means that the first source cited in a research paper (reference 1) is also the first source listed in the References section of the paper, the second is the second source in the list and so on. The following two sample references follow ICMJE guidelines and would serve as the opening entries in a numerical list of references: • 1. Wilson S, Bond F. Political and personal readings of the earliest zone poem. Urban Poetry. 2016;12:72–94. doi:00.0000/00000000000000. • 2. Samuel H, Watson M. Political Poetry and Modern Urbanity. London: Big City Press; 2013.

As these examples show, the information required for a complete reference varies according to the nature of the source cited, just as it does with author–date references. In addition, the names of journals (but not books) are often abbreviated when preparing numerical references. It is essential, however, that the correct or standard abbreviation for each journal be used when shortening journal titles, which can easily be confused in their abbreviated forms, so a little research may be necessary to determine the right abbreviation. Use of the complete journal title is recommended when there is any doubt or there is no standard abbreviation. A cautionary note is in order when writing sequential numerical references. Adding or deleting sources from a numerical list of references that has been arranged according to the order in which sources are first cited can necessitate changes in subsequent list entries as well as in the in-text citations, and the same is the case with any changes to those in-text citations. The reason is simple: if, for example, you remove reference 3 from the text or list, what was reference 4 becomes reference 3, what was reference 5 becomes reference 4 and so on. If you add that removed reference back in elsewhere more alterations will ensue. It is therefore wise to check and finalise the order of the reference list very carefully indeed after all the in-text citations are in their final places, and to ensure that the assigned reference numbers agree with the utmost accuracy between in-text citations and the list of references.

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Our scientific proofreading services for the authors of a wide variety of scientific journal papers are especially popular, but we also offer manuscript proofreading services and have the experience and expertise to proofread and edit manuscripts in all scholarly disciplines, as well as beyond them. We have team members who specialise in medical proofreading services , and some of our experts dedicate their time exclusively to PhD proofreading and master’s proofreading , offering research students the opportunity to improve their use of formatting and language through the most exacting PhD thesis editing and dissertation proofreading practices. Whether you are preparing a conference paper for presentation, polishing a progress report to share with colleagues, or facing the daunting task of editing and perfecting any kind of scholarly document for publication, a qualified member of our professional team can provide invaluable assistance and give you greater confidence in your written work.

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Science/Medical/Biology/Chemistry: How to cite sources

• How to Read and Write a Scientific Article
• How to cite sources
• BIOL 240 Video : How to use the Bergey's Manual

Why Cite Sources

Once you have located and read an adequate number of sources, incorporated ideas from your reading with your own understanding of the topic, and presented your analysis of your topic in a research paper, it is essential to cite the sources and you must use the proper bibliographic format to do so.

The main reason for citing your sources is to give credit to those authors whose ideas you used in your research. Even when you do not quote directly from another work, if reading that source contributed to the ideas presented in your paper, you must give the authors proper credit by including their work in your bibliography. Citing your sources allows readers of your work to easily find the sources to which you've referred.

If you do not cite the sources upon which your research is based, you will be guilty of plagiarism. Plagiarism is using the ideas and writings of others and representing them as your own. Even if you do not copy another source word-for-word, but rather rephrase the source without attributing it to the original author by including a citation, you are guilty of plagiarism. Plagiarism is a serious violation of academic standards and is punishable with a failing grade, possible expulsion from the institution, and may subject you to ostracism by your peers. The increasing availability of electronic information has unfortunately made it easy to copy another author's works.

(The text in this box was created by Eric Brenner)

"Works Cited" or "References" vs. "Bibliography"

The most common way to cite sources is to use a "Works Cited" or "References" list at the end of your research paper. "Works Cited" is the title of your list of citations when using the MLA (Modern Language Association) format ; the title "References" is used when citing sources using APA (American Psychological Association) style. The list includes a citation for each of the sources you used to write your paper. The citations are formatted in a consistent style according to whichever citation format is used. Many instructors specify which format they prefer; some leave it up to the students as long as they maintain one consistent format.

A "Bibliography" is not the same as a "Works Cited" or "References" list. In your "Works Cited" or "References" you only list items you have actually cited in your paper. In a "Bibliography" you list all of the material you may have consulted in preparing your essay, whether or not you have actually cited the work. A "Bibliography" may include any sources related to the topic of the research paper.

The list of all citations is commonly organized in a single alphabetical list. Each different type of source--book, magazine article, journal article, newspaper article, article from a reference book, World Wide Web page--has a precise format that is specified by the given format (MLA, APA or other).

Which type of format do you need?

• MLA Citation 9th ed. Guide from Skyline College Library
• MLA 9th ed. Short Handout from Skyline College Library
• MLA FORMAT (commonly used for English and other humanities papers) From Purdue University's Online Writing Lab.
• APA Citation Guide from Skyline College Library
• APA format from the Purdue Online Writing Lab (OWL) website
• APA Sample Paper
• Chicago Style (commonly used for history papers)
• CSE Style (commonly used for science papers)

Legal Citation Formats: MLA, APA, Turabian Style Hints (from LexisNexis)

Cases MLA Case title, U.S. Reports citation, page numbers, docket number, name of the court, year of decision, Internet address, and date of accessing the site. Example: Fullilove v. Klutznick. 448 U.S. 448. 448-554. No. 78-1007. US Supreme Court. 1980. Online. LexisNexis® Academic. (11 Feb. 2010).

APA Case title, U.S. Reports citation, year of decision, and Internet address. Example: Fullilove v. Klutznick, 448 U.S. 448 (1980) [Online] Retrieved from http://www.lexisnexis.com/us/lnacademic.

Turabian Case Name, Reports Citation (Year of Decision) LexisNexis main URL (accessed date for Turabian). Example: Fullilove v. Klutznick, 448 U.S. 448 (1980). Accessed 13 February 2010; available from LexisNexis Academic http://www.lexisnexis.com/us/lnacademic

Codes MLA Title number, statute book of the U.S. Code. section. year. publication medium, name of computer service, and date of access. Example: 42 US Code. Sec. 405. 1998. Online. LexisNexis® Academic. 13 February 2010.

APA Act or Section Name, Abbreviated Citation et seq. (Edition year of the Code) Retrieved date from LexisNexis Academic database. Example: Carl D. Perkins Vocational and Applied Technology Education Act, 20 U.S.C. §2301 et seq. (2006). Retrieved 13 February 2010 from LexisNexis Academic database.

Turabian Act or Section Name. U.S. Code. Year. Vol(Which is really title number, but Turabian style forces you to use Volume), section number. Accessed date; available from LexisNexis Academic Example: Carl D. Perkins Vocational and Applied Technology Education Act. U.S. code. 1998. Vol 20, sec. 2301. Accessed 24 March 2005; available from LexisNexis Academic

In-text Citation

• MLA In-text Citation Guide from Skyline College Library
• MLA in-text documentation: How to Cite a Work within the Text of Your Paper (Parenthetical Citations)
• APA Style In-text Citation Guide from Skyline College Library
• APA in-text documentation: How to Cite a Work within the Text of Your Paper (Parenthetical Citations)

Annotated Bibliography

• How to Prepare an Annotated Bibliography
• Questions for Evaluating and Annotating Any Source
• Annotation examples Examples for Informative/Descriptive Annotation and Critical Annotation.
• Annotated Bibliography Samples from OWL (Online Writing Lab) Samples for APA, MLA and Chicago Manual Style.
• MLA Style Annotated Bibliography (links to PDF document) MLA formatting with explanations.

Automated Bibliography Formatting

There are quite a number of free automated citation generators available on the Web; for examp

easybib  -- free only for MLA citation

bibme   -- limited free APA, MLA and Chicago citation

KnightCite  -- free APA, MLA and Chicago citation

mybib.com -- free  APA, MLA, Chicago , AMA and many other citations

zoterobib -- free  APA, MLA, Chicago , AMA, CSE and many other citations; good tool to create,  verify, or convert your citation style.

Note: always check for accuracy.

Tutorials on Citing Sources

• MLA Tutorial (from Hunter College, City University of New York)
• MLA Interactive Tutorial (from Tallahassee Community College)
• APA Interactive Tutorial (from Tallahassee Community College)
• APA Tutorial (from University of Southern Mississippi)
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• URL: https://guides.skylinecollege.edu/science

Compiled by Timothy T. Allen , revised 2000. This paper greatly expands upon a handout originally prepared by an unknown author for distribution to students in introductory earth science courses at Dartmouth College. The work is presented here without copyright, although acknowledgement is (of course) appreciated. This document is also available in in Adobe Acrobat Format

Introduction

It is important to properly and appropriately cite references in scientific research papers in order to acknowledge your sources and give credit where credit is due. Science moves forward only by building upon the work of others. There are, however, other reasons for citing references in scientific research papers. Citations to appropriate sources show that you've done your homework and are aware of the background and context into which your work fits, and they help lend validity to your arguments. Reference citations also provide avenues for interested readers to follow up on aspects of your work -- they help weave the web of science. You may wish to include citations for sources that add relevant information to your own work, or that present alternate views. The reference citation style described here is a version of the "Author, Date" scientific style, adapted from Hansen (1991) and the Council of Biology Editors (1994). Harnack & Kleppinger (2000) have adapted "CBE style" to cite and document online sources . When to Cite References in Scientific Research Papers You should acknowledge a source any time (and every time) you use a fact or an idea that you obtained from that source. Thus, clearly, you need to cite sources for all direct quotations. But you also need to cite sources from which you paraphrase or summarize facts or ideas -- whether you've put the fact or idea into your own words or not, you got the fact or idea from somebody else and you need to give them proper acknowledgement (even if an idea might be considered "common knowledge," but you didn't know it until you found it in a particular source).

If you have more than one source by the same author published in the same year, distinguish them both in the in-text citation and in the reference list, by appending the letters a, b, c... to the year, in the order in which the different references appear in your paper. (For example: Allen 1996a, 1996b.)

If your source of information has no individual identifiable author, use the name of the organization to which the work can be attributed in place of the author's name:

For internet sources without any identifiable author or date, simply use the URL address as the in-text citation:

As New England is located at the convergence of several distinct storm tracks ( http://www.mountwashington.org/mtw_mtn.htm ), we expect to find clear differences in isotopic composition among seasons and potentially among different rain storm events (Fig. 1).

Such a source would be omitted from your References Cited or Bibliography section.

References Cited (in this document)

Council of Biology Editors, 1994, Scientific style and format: the CBE manual for authors, editors, and publishers, 6th edition, Cambridge University Press, New York. 825 p.

Harnack, A., and Kleppinger, E., 2000, Online! A reference guide to using internet sources , Bedford/St. Martin's, http://www.bedfordstmartins.com/online/index.html (August 1, 2000).

Want to create or adapt books like this? Learn more about how Pressbooks supports open publishing practices.

Characteristics of References

• Provides the reader with information about who conducted the research, when it was published and the journal that published the work.
• Provides detailed information about author names, article title, journal name, volume, issue and page numbers so that readers can easily find the source of the information.
• Acknowledges the scientist(s) who conducted the research and/or the journal article where the research was originally published.  

The References (or Bibliography) section should list all the sources of information that were used in the poster.   This section appears at the end of the poster.   The References section ( Figs. 2 and 8 ) typically contains all journal articles (i.e., primary sources) but it can also contain secondary sources (e.g., newspapers, documentaries, government reports).   References tell the reader where the original data, information, technique, and/or method can be obtained, who conducted the work and when the paper was published.    

In posters, in-text citations are used to tell the reader where information was obtained.   An in-text citation should appear after every sentence in the poster that describes the work of others.   This includes all sentences that describe discoveries, findings, data, information, experiments, results, techniques, methods, dates, locations, etc.  

In-text citations can be done using either (1) superscript numbers or (2) authors last name, followed by year published.  

• Polar bear cubs were 25% larger when fed a high-protein diet compared to high-sugar diet. 1      
• Polar bear cubs were 25% larger when fed a high-protein diet compared to high-sugar diet (Jones and Smith, 2018).  

The “1” and “Jones and Smith, 2018” both refer to the same journal article:   E.J. Jones and W. A. Smith (2018), Journal of Natural Science, Vol. 53, Issue 12, pages 36-45.   Both types of in-text citations are acceptable for use in posters.   Authors typically choose superscript numbers to save space.      

Formatting References

You have likely been taught about MLA (Modern Language Association of America) or APA (American Psychological Association) formatting and style guide in middle or high school.   Many of you are likely proficient in these styles.   For most posters you likely will not follow the MLA nor APA styles when citing your sources.   There is a practical explanation for why these two styles often are not used in a poster. It is because there are thousands of different professional scientific societies around the world and each society has its own preferred formatting style that they use in publications for their journals and conferences.   Therefore, citation styles will vary depending on where a poster is presented.   In fact, many scientists use software, that, with a click of a button, will transform all of their citations into the proper style and format for any journal or conference.

Nonetheless, we provide 15 examples below of how one could cite primary sources (examples 1-5 below) and secondary sources (examples 6-15 below) of information in a scientific poster.  

Figure 8. References List

Citing Primary Sources

Peer-reviewed journal articles are considered primary sources.   Patents and Published Technical Reports from Government Agencies and Universities are also considered primary sources of information.   Five examples of how to cite primary sources are numbered below 1-5.  

1. Journal Article in Print:   Most journals are printed on paper others are entirely available online.   Authors Names. (Year Published in parenthesis). Article Title.   Journal Name, Volume Number (Issue Number in parenthesis): Page Numbers.  

1A. Journal Article with one or two authors:

McMurran, M. and Christopher, G. (2009). Bayes factors increases criminal sentence recommendations. Legal & Criminological Psychology, 14(1):101-107.

1B. Journal Article with more than two authors:  

Post, E., et al. (2009). Genome studies of quorum sensing organisms. Science, 325(5946):1355-1358.

2. Online Journal Article:   These journals are electronic and not printed on paper.   Authors Names. (Year Published in parenthesis). Title of article. Journal name. Volume number and or page numbers.   Include complete URL link in full or DOI if known.    

Dionne, M.S. and Schneider, D.S. (2002). Adaptive mutability in targeted microRNA infections. Genome Biol. 3:10.3559. http://genomebiology.com/2002/3/4/reviews/1010  

3. Government Technical Report in Print: Author names or name of organization. (Year Published in parenthesis). Report title.   Report Number. Name of government agency that published report, Place of publication.  

Smith, G.I. and Chen Y.P. (2018). Growth stages and tolerable fire intervals for Georgia’s native vegetation data sets. Report no. 247. U.S. Department of Interior. New York, NY, USA.

4. Government Technical Report Published Online: Author names or name of organization. (Year Published in parenthesis). Report title.   Report Number. Name of government agency that published report. Place of publication.   Date retrieved followed by complete URL link in full or DOI if known.  

Spandone, H.K. et al. (2017). Energy futures for Midwestern wind farms. Report no. C2.4715.12. U.S. Department of Energy. Washington D.C., USA.   Retrieved on February 15, 2017 from https://www.energy.gov/science-innovation/energy-sources/renewable-energy/wind

5. Patent : Author names. Date in parenthesis. Title of patented item, technique, method or process. Patent number.

Odell, J.C. (1970, April). Process for batch culturing. U.S. patent 484,363,770.

Citing Secondary Sources

Secondary sources report on and interpret results that have been presented in primary sources.   Secondary sources include books, documentaries, magazines, newspapers, podcasts, webpages from government agencies and universities.   Ten examples of how to cite secondary sources are numbered below 6-15.      

6. Book Chapter : Authors names. (Date of publication in parenthesis). Chapter title, page numbers. Editors of book, Book Title, Place of publication.   Name of publisher.  

Forman, M.S., and Valsamakis, A. (2003). Specimen collection, transport, and processing: virology, p. 1227-1241. Murray, P.R., et al. (Eds.), Manual of clinical microbiology, 8th ed, Washington, D.C. Penguin Press.  

Anderegg, D. (2007). Nerds: Who they are and why we need more of them. New York, NY. Jeremy P. Tarcher, Penguin Press.  

8. Magazine Article in Print :

Road map to a great deal. (2009, October). Consumer Reports, 74(10), 44-47.

9. Magazine Article Published Online :

Taibbi, M. (2009, September 3). Sick and wrong. Rolling Stone, 1086, 58-65. Retrieved on February 22, 2020 from http://www.rollingstone.com  

10. Newspaper Article in Print:

Lucchetti, A. & Craig, S. (2009, September 11). Morgan Stanley taps new boss. The Wall Street Journal, pp. A1, A16.  

11. Newspaper Article Published Online :

Moran, S. (2009, September 7). If you don’t snooze, you lose: Most Americans aren’t getting enough sleep. And for both adults and students, there are health consequences. Star Tribune. Retrieved on August 6, 2019 from http://www.startribune.com /  

12. Podcast :

Nature (Producer). (2009, July 16). Moon gazing in the Southern hemisphere, Audio podcast. Retrieved on November 5,2009, from http://www.nature.com/nature/podcast/index-2009-07-16.html  

13. Documentary, Video or Movie :

Donner, R. & Lee, S. (Producers), & Hood, G. (Director). (2009). X-Men Origins: Wolverine [DVD]. USA: Twentieth Century-Fox Film Corporation.  

14. Personal Web Page : In most instances a web page is not used as a reference in a poster.  

Wilson, E.O. (1999, September). Biological Diversity: The Oldest Human Heritage, New York State Museum, Albany. Retrieved on July 12, 2020 from https://eowilsonfoundation.org/e-o-wilson/  

15. Web Page of Organization or Group of Authors : In most instances, a webpage is not used as a reference in a poster.  

National Museum of American History. (2006, July 7). National museum of American history displays recent hip-hop acquisitions. Retrieved from https://americanhistory.si.edu  

Scientific Posters: A Learner's Guide Copyright © 2020 by Ella Weaver; Kylienne A. Shaul; Henry Griffy; and Brian H. Lower is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License , except where otherwise noted.

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How to Cite a Research Paper

Last Updated: March 29, 2024 Fact Checked

This article was reviewed by Gerald Posner and by wikiHow staff writer, Jennifer Mueller, JD . Gerald Posner is an Author & Journalist based in Miami, Florida. With over 35 years of experience, he specializes in investigative journalism, nonfiction books, and editorials. He holds a law degree from UC College of the Law, San Francisco, and a BA in Political Science from the University of California-Berkeley. He’s the author of thirteen books, including several New York Times bestsellers, the winner of the Florida Book Award for General Nonfiction, and has been a finalist for the Pulitzer Prize in History. He was also shortlisted for the Best Business Book of 2020 by the Society for Advancing Business Editing and Writing. There are 8 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 411,480 times.

When writing a paper for a research project, you may need to cite a research paper you used as a reference. The basic information included in your citation will be the same across all styles. However, the format in which that information is presented is somewhat different depending on whether you're using American Psychological Association (APA), Modern Language Association (MLA), Chicago, or American Medical Association (AMA) style.

Referencing a Research Paper

• In APA style, cite the paper: Last Name, First Initial. (Year). Title. Publisher.
• In Chicago style, cite the paper: Last Name, First Name. “Title.” Publisher, Year.
• In MLA style, cite the paper: Last Name, First Name. “Title.” Publisher. Year.

Citation Help

• For example: "Kringle, K., & Frost, J."

• For example: "Kringle, K., & Frost, J. (2012)."
• If the date, or any other information, are not available, use the guide at https://blog.apastyle.org/apastyle/2012/05/missing-pieces.html .

• For example: "Kringle, K., & Frost, J. (2012). Red noses, warm hearts: The glowing phenomenon among North Pole reindeer."
• If you found the research paper in a database maintained by a university, corporation, or other organization, include any index number assigned to the paper in parentheses after the title. For example: "Kringle, K., & Frost, J. (2012). Red noses, warm hearts: The glowing phenomenon among North Pole reindeer. (Report No. 1234)."

• For example: "Kringle, K., & Frost, J. (2012). Red noses, warm hearts: The glowing phenomenon among North Pole reindeer. (Report No. 1234). Retrieved from Alaska University Library Archives, December 24, 2017."

• For example: "(Kringle & Frost, 2012)."
• If there was no date on the research paper, use the abbreviation n.d. : "(Kringle & Frost, n.d.)."

• For example: "Kringle, Kris, and Jack Frost."

• For example: "Kringle, Kris, and Jack Frost. "Red Noses, Warm Hearts: The Glowing Phenomenon among North Pole Reindeer." Master's thesis."

• For example: "Kringle, Kris, and Jack Frost. "Red Noses, Warm Hearts: The Glowing Phenomenon among North Pole Reindeer." Master's thesis, Alaska University, 2012."

• For example: "Kringle, Kris, and Jack Frost. "Red Noses, Warm Hearts: The Glowing Phenomenon among North Pole Reindeer." Master's thesis, Alaska University, 2012. Accessed at https://www.northpolemedical.com/raising_rudolf."

• Footnotes are essentially the same as the full citation, although the first and last names of the authors aren't inverted.
• For parenthetical citations, Chicago uses the Author-Date format. For example: "(Kringle and Frost 2012)."

• For example: "Kringle, Kris, and Frost, Jack."

• For example: "Kringle, Kris, and Frost, Jack. "Red Noses, Warm Hearts: The Glowing Phenomenon Among North Pole Reindeer.""

• For example, suppose you found the paper in a collection of paper housed in university archives. Your citation might be: "Kringle, Kris, and Frost, Jack. "Red Noses, Warm Hearts: The Glowing Phenomenon Among North Pole Reindeer." Master's Theses 2000-2010. University of Alaska Library Archives. Accessed December 24, 2017."

• For example: "(Kringle & Frost, p. 33)."

• For example: "Kringle K, Frost J."

• For example: "Kringle K, Frost J. Red noses, warm hearts: The glowing phenomenon among North Pole reindeer."

• For example: "Kringle K, Frost J. Red noses, warm hearts: The glowing phenomenon among North Pole reindeer. Nat Med. 2012; 18(9): 1429-1433."

• For example, if you're citing a paper presented at a conference, you'd write: "Kringle K, Frost J. Red noses, warm hearts: The glowing phenomenon among North Pole reindeer. Oral presentation at Arctic Health Association Annual Summit; December, 2017; Nome, Alaska."
• To cite a paper you read online, you'd write: "Kringle K, Frost J. Red noses, warm hearts: The glowing phenomenon among North Pole reindeer. https://www.northpolemedical.com/raising_rudolf"

• For example: "According to Kringle and Frost, these red noses indicate a subspecies of reindeer native to Alaska and Canada that have migrated to the North Pole and mingled with North Pole reindeer. 1 "

Community Q&A

• If you used a manual as a source in your research paper, you'll need to learn how to cite the manual also. Thanks Helpful 0 Not Helpful 0
• If you use any figures in your research paper, you'll also need to know the proper way to cite them in MLA, APA, AMA, or Chicago. Thanks Helpful 0 Not Helpful 0

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• ↑ https://askus.library.wwu.edu/faq/116659
• ↑ https://guides.libraries.psu.edu/apaquickguide/intext
• ↑ https://owl.purdue.edu/owl/research_and_citation/chicago_manual_17th_edition/cmos_formatting_and_style_guide/general_format.html
• ↑ https://libanswers.snhu.edu/faq/48009
• ↑ https://www.chicagomanualofstyle.org/tools_citationguide/citation-guide-2.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/mla_style/mla_formatting_and_style_guide/mla_in_text_citations_the_basics.html
• ↑ https://morningside.libguides.com/MLA8/location
• ↑ https://owl.purdue.edu/owl/research_and_citation/ama_style/index.html

About This Article

To cite a paper APA style, start with the author's last name and first initial, and the year of publication. Then, list the title of the paper, where you found it, and the date that you accessed it. In a paper, use a parenthetical reference with the last name of the author and the publication year. For an MLA citation, list the author's last name and then first name and the title of the paper in quotations. Include where you accessed the paper and the date you retrieved it. In your paper, use a parenthetical reference with the author's last name and the page number. Keep reading for tips on Chicago and AMA citations and exceptions to the citation rules! Did this summary help you? Yes No

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5 Accessing Scientific Literature and Referencing

An essential skill for all scientists to master is the ability to access relevant and reliable scientific information from a variety of sources.

You will need access to scientific literature for a variety of reasons:

• designing an experiment
• writing an article or essay
• designing a poster.

All of these tasks involved sourcing reliable, authoritative literature, and you’ll need to know how to reference it.

This chapter will provide student scientists with assistance in navigating the many avenues for locating scientific literature and referencing it, including using the reference management software EndNote.

5.1 Types of scientific literature

The two main types of scientific literature are original investigations and literature reviews.

Original investigations ( Figure 5.1 ) are published accounts of new studies undertaken on a particular topic. They will generally step the reader through the stages of the study:

• introduction

Published literature reviews ( Figure 5.2 ) present a synthesis and evaluation of the existing literature on a particular topic with the aim of gaining a new, deeper understanding of the topic. The review article will be structured around themes rather than stages of the scientific method.

5.2 Accessing scientific literature

You can locate scientific literature via Google Scholar , online databases such as PubMed, and the University of Southern Queensland library website when you are looking for a specific article or searching for literature on a specific topic.

Google Scholar

Google Scholar provides a simple way to perform a broad search for scholarly literature. From one place, you can search across many disciplines and sources:

• court opinions.

Academic publishers, professional societies, online repositories, universities and other web sites all publish these types of literature. Google Scholar helps you find relevant work across the world of scholarly research.

Box 5.1: Search tips

• Set your preferences to retrieve your university library resources: For example, select Settings > Library Link > add University of Southern Queensland Library > Save
• Use the asterisk * (e.g. child* will find child, children, childhood, childless)
• Use the asterisk as a placeholder to find a word within words e.g. “acquired * injury” finds acquired brain injury
• Use quotes to search by phrase (e.g. “type 2 diabetes” or “social media”)

Try this search in Google Scholar: “patient information” AND “back pain”

Extra help with using Google scholar is at this webpage. 

Databases, what are they and how do I use them to find information?

Databases are another way to find quality academic and scholarly information. The USQ library subscribes to many databases that are relevant to your studies in human physiology, such as:

• Web of Science
• ClinicalKey
• ScienceDirect

PubMed is a database that comprises of more than 26 million citations for biomedical literature from MEDLINE, life science journals and online books. Citations may include links to full-text content from PubMed Central and publisher websites.

Journals contain scholarly articles written by experts in specific disciplines. This tutorial explains what scholarly journals are and how to access them from the USQ library.

5.3 Determining if an article is scholarly or peer reviewed

It can be hard to work out if a journal is scholarly or peer reviewed. There is a lot of information online that looks like proper science, but isn’t! These tips can help you determine if you are accessing reliable information.

If searching in a library database:

• Check to see if there is a box on the database search page that allows you to limit your search results to refereed or peer-reviewed journal articles.

If you already have a journal article or title, use these option to check if it is scholarly or peer reviewed: 

• Look at the article itself for a header or similar that indicates refereed or reviewed.
• Look at the table of contents of the journal. Often items are grouped under a heading like ‘reviewed articles’.
• Check the journal’s website to see if a statement is made about the content being peer reviewed or refereed. However, be aware that not all the contents of a refereed journal will be refereed (e.g. books reviews, practice, commentaries, editorials are not peer reviewed).
• Look for the Ulrichsweb database in your library catalogue. If you have access, use the ‘Quick Search’ drop down and select ‘Title (keyword)’ and type in the journal title. Next to journal titles that include at least some refereed content is the image of a black and white striped  ‘referee’s shirt’.  You can also click on the journal title and you will see ‘Refereed – yes or no’.

5.4 Library website resources to assist with searching for authoritative information

Your university library will provide tutorials and resources to help you search for authoritative information.

5.5 Referencing

Anyone who reads your work will need to know where you got your information from if you didn’t generate it yourself (e.g. the results of your experiment). The reference section provides a list of the references that you cited in the body of your work, whether it be a literature review, original investigation research article or essay.

It is important to accurately cite references in research papers to acknowledge your sources and ensure credit is appropriately given to authors of work you have referred to. An accurate and comprehensive reference list also shows your readers that you are well-read in your topic area and are aware of the key papers that provide the context to your research.

It is important to keep track of your resources and to reference them consistently in the format required by the publication in which your work will appear. Most scientists will use referencing software to store details of all of the journal articles (and other sources) they use while writing their review article. This software also automates the process of adding in-text references and creating a reference list.

In-text citations indicate where (within your sentences) you have used the ideas of other scientists. The in-text citations will either be provided as a number, or as the name of the author and date of publication. A reference list is a list of all the sources that you have used as in-text references in your scientific paper that enables the reader of your work to locate and verify the sources you have use.

Here are two basic formats for a reference list:

• an alphabetical listing by first author’s last name (author–date system)
• a numerical listing that reflects the order of the citations in the body of the paper (number format).

The format will depend on the journal of publication, as each journal has their own specific referencing format.

A bibliography tends to use the author–date format, as the works might not be cited in the text.

Author–date system

Author-date reference styles indicate in-text citations by placing the author’s surname and the date of publication in brackets, and the reference list is in alphabetical order by author’s surname. Harvard and APA are examples of author date styles.

The associated images show a section of the discussion, and a section of the reference list of a research article (Bain et al., 2014) that has used an author-date system.

Your university library will provide guidance and examples of the referencing styles you are expected to use. Ask your tutor which style you are to use for your assignment.

This short video shows you the basics of Harvard referencing. Please note there are different interpretations of the style and use the resources provided by your university library when composing your own in-text citations and reference lists.

Click the drop down below to review the terms learned from this chapter.

Bain, A.R., Morrison, S.A., & Ainslie, P.N. (2014). Cerebral oxygenation and hyperthermia. Frontiers in Physiology, 5 , 92.

How To Do Science Copyright © 2022 by University of Southern Queensland is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License , except where otherwise noted.

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Writing a scientific paper.

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What is a "good" introduction?

Citing sources in the introduction, "introduction checklist" from: how to write a good scientific paper. chris a. mack. spie. 2018..

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This is where you describe briefly and clearly why you are writing the paper. The introduction supplies sufficient background information for the reader to understand and evaluate the experiment you did. It also supplies a rationale for the study.

• Present the problem and the proposed solution
• Presents nature and scope of the problem investigated
• Reviews the pertinent literature to orient the reader
• States the method of the experiment
• State the principle results of the experiment

It is important to cite sources in the introduction section of your paper as evidence of the claims you are making. There are ways of citing sources in the text so that the reader can find the full reference in the literature cited section at the end of the paper, yet the flow of the reading is not badly interrupted. Below are some example of how this can be done:     "Smith (1983) found that N-fixing plants could be infected by several different species of Rhizobium."     "Walnut trees are known to be allelopathic (Smith 1949,  Bond et al. 1955, Jones and Green 1963)."     "Although the presence of Rhizobium normally increases the growth of legumes (Nguyen 1987), the opposite effect has been observed (Washington 1999)." Note that articles by one or two authors are always cited in the text using their last names. However, if there are more than two authors, the last name of the 1st author is given followed by the abbreviation et al. which is Latin for "and others". 

From:  https://writingcenter.gmu.edu/guides/imrad-reports-introductions

• Indicate the field of the work, why this field is important, and what has already been done (with proper citations).
• Indicate a gap, raise a research question, or challenge prior work in this territory.
• Outline the purpose and announce the present research, clearly indicating what is novel and why it is significant.
• Avoid: repeating the abstract; providing unnecessary background information; exaggerating the importance of the work; claiming novelty without a proper literature search. 
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Purdue Online Writing Lab Purdue OWL® College of Liberal Arts

Tables, Figures, and Equations

Welcome to the Purdue OWL

This page is brought to you by the OWL at Purdue University. When printing this page, you must include the entire legal notice.

Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.

Tables, figures, and equations are the three categories of extra-textual items that require numbering and labelling. Each should be numbered consecutively throughout the paper – i.e., the numbering system does not start over in a new section or in an appendix, but simply continues on. For instance, if you have four figures in Section I, the first figure in Section II is simply Fig. 5, not Fig. II-1 or similar. The numbering of figures does not impact the numbering of tables or equations, but each category is numbered independently – e.g., if you have three figures and then a table, that table is still Table I, not Table IV.

Please note that tables, figures, and equations should always be introduced within the body of the paper before you show the actual table / figure / equation. If the data, or the figure itself, comes from an outside source, you should cite that source when you introduce the table / figure / equation. Moreover, you should follow the table / figure / equation with some form of explanation or connection to the broader point of your paper. In the case of equations, it is of primary importance to insure that, at some point in either the introduction or the explanation of the equation, you define the symbols used. No matter how self-explanatory an expression like φ 2 = 3*ξ  may seem, if your reader doesn’t know what φ  and ξ  signify, you may as well be typing nonsense.

In this context, “table” refers exclusively to data laid out in a grid format; if the data is rendered into a graph or other more visual format, that is a figure. In formatting tables, vertical lines are optional, and double horizontal lines may be used to signify the beginning and end of the table. Some horizontal lines may be removed if they are not necessary to understanding the table.

The table is labelled with the same format as a section or appendix heading, along with a title. Note that tables are enumerated with Roman numerals. Below the table, you may include explanatory notes as necessary; notes that apply to a specific part of the table should be marked in the same manner as a footnote, but notes that apply to the whole table are merely treated as captions.

See below for an example of what a table might look like in an IEEE paper. Note that this image (as well as the other ones on this page) have been zoomed in for clarity and detail.

Example of a table in an IEEE paper. Note the small caps formatting for the table's title and the presence of a note underneath the table in a "caption" position.

“Figure” is a broad term that covers any image, graph, diagram, etc. that is neither a “table” nor an “equation”. Please note that these should always simply be referred to as “figures” – IEEE format does not recognize labels such as “graph 1”.

Unlike tables, the label for a figure goes below the figure. It is in sentence case, rather than small caps, and does not include line breaks. The format is as follows: “Fig.”, followed by the number, then a period and an em space, followed by the title for the figure. It is recommended that figures be titled in an informative manner that includes what/where/when information. For instance, an effective title might be something like “Fig. 3. Number of citation errors in undergraduate papers at Purdue University, 2005-2015.”

If parts of the figure are labeled specifically, this should be done with a lowercase letter within parentheses. The explanation of those labels should be included in the label for the overall figure. See the following example:

Example of a figure in an IEEE paper. Note that the caption formatting differs from the formatting for a table note.

It is acceptable to use the built-in functions of your word processor to create equations, but there are a few elements of the process that require your attention. First, note that while variables and numbers should be italicized, the following elements of equations should be set in roman type: function names, units, words, and abbreviations thereof.

Equations are centered on the page and labeled with Arabic numerals, right-aligned, in parentheses, and referred to only by those numbers in the text – e.g., you should always say “as seen in (3)” rather than “as seen in Equation (3)”. The only exception to this is if the equation number would begin a sentence, in which case you can say “Equation (3) shows…” in order to avoid the awkwardness of beginning a sentence with a numeral.

Example of an equation in an IEEE paper. Note that the equation has been written using Microsoft Word's built-in "insert equation" feature.

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How to Cite the References of a Scientific Paper

1. rules to follow.

There are two rules to follow in the references section, just as in the acknow­ledgments section.

First, list only significant published references. References to unpublished data, abstracts, theses, and other secondary materials should not clutter up the references or literature-cited section. If such a reference seems essential, you may add it parenthetically or, in some journals, as a footnote in the text. A paper that has been accepted for publication can be listed in the literature cited, citing the name of the journal followed by “in press” or “forthcoming.”

Second, ensure that all parts of every reference are accurate. Doing so may entail checking every reference against the original publication before the manuscript is submitted and perhaps again at the proof stage. Take it from an erstwhile librarian: There are far more mistakes in the references section of a paper than anywhere else.

Don’t forget, as a final check, to ensure that all references cited in the text are indeed listed in the literature cited and that all references listed in the liter­ature cited are indeed cited somewhere in the text.

2. ELECTRONIC AIDS TO CITATION

Checking that every reference is accurate, and that all cited items appear in the reference list, has become much easier in the electronic era. Common word­processing programs include features for tasks such as creating, numbering, and formatting footnotes and endnotes. These features can aid in citing refer­ences and developing reference lists. Some journals, however, say not to use these features, which can interfere with their publishing process. Check the journal’s instructions to authors in this regard.

Perhaps more notably, citation-management software—such as EndNote, Reference Manager, and RefWorks—lets a researcher develop a database of references and use it to create reference lists in the formats of many journals. Rather than keying in the information on each reference, you may be able to import it from bibliographic databases. Once the information is accurately entered, it should remain correct whenever it appears in a reference. Do, how­ever, still check references. Electronic gremlins sometimes lurk. So does human error; if somehow you indicated the wrong reference, the wrong reference will appear.

If you are not using reference-management software, consider looking into doing so. Using such software can especially save you time ifyou will cite some of the same references in multiple publications or if journals in your field have a variety of reference styles. Ifyou study or work at a university or other research institution, you might easily be able to obtain such software through it. Also, some universities provide instruction in using such software, for example, through their libraries. Consider checking.

3. CITATIONS IN THE TEXT

Many authors use slipshod methods in citing literature. A common offender is the “handwaving reference,” in which the reader is glibly referred to “Smith’s elegant contribution” without any hint of what Smith reported or how Smith’s results relate to the present author’s results. If a reference is worth citing, the reader should be told why.

Even worse is the nasty habit some authors have of insulting the authors of previous studies. It is probably all right to say “Smith (2015) did not study. . . .” But it is not all right to say “Smith (2015) totally overlooked, . . .” “Smith (2015) ignored, . . .” or “Smith (2015) failed to. . . .”

Some authors get into the habit of putting all citations at the end of sentences. This is wrong. The reference should be placed at that point in the sentence to which it applies. Michaelson (1990) gave this example:

We have examined a digital method of spread-spectrum modulation for multiple-access satellite communication and for digital mobile radiote­lephony. 1,2

Note how much clearer the citations become when the sentence is recast as follows:

We have examined a digital method of spread-spectrum modulation for use with Smith’s development of multiple-access communication 1 and with Brown’s technique of digital mobile radiotelephony. 2

4. REFERENCE STYLES

Journals vary considerably in their style of handling references. O’Connor (1978) looked at 52 scientific journals and found 33 different styles for listing references. Some journals include article titles within references, and some do not. Some insist on inclusive pagination, whereas others print the numbers of first pages only.

If you use an electronic reference management system, and if that system includes the styles of all the journals in which you might like to publish, you might not need to concern yourself in detail with differences among refer­ence styles. In that case, perhaps just skim—or even skip—the sections of this chapter that discuss formats for citing and listing references. If, however, you might at least occasionally be preparing and citing references by traditional means, we advise you to read these sections.

Whether electronically or otherwise, the smart author retains full informa­tion about every item that might be cited. Then, in preparing a manuscript, he or she has all the needed information. It is easy to edit out information; it is indeed laborious to track down 20 or so references to add article titles or end­ing pages when a journal editor requires you to do so. Even if you know that the journal to which you plan to submit your manuscript uses a short form (no article titles, for example), you would still be wise to establish your reference list in the complete form. This is good practice because (1) the journal you selected may reject your manuscript, and you may then decide to submit the manuscript to another journal, perhaps one with more demanding requirements, and (2) it is more than likely that you will use some of the same references again, in later research papers, review papers (and most review journals demand full references), or books. When you submit a manuscript for publication, make sure that the references are presented according to the instructions for authors. If the references are radically different, the editor and referees may assume that this is a sign of previous rejection or, at best, obvious evidence of lack of care.

Although there is an almost infinite variety of reference styles, most jour­nals cite references in one of three general ways that may be referred to as name and year, alphabet-number, and citation order.

4.1. Name and Year System

The name and year system (often called the Harvard system) has been very popu­lar for many years and is used by many journals and books, including this one. Disciplines in which it is popular include the social sciences. Its big advantage is convenience to the author. Because the references are unnumbered, refer­ences can be added or deleted easily. No matter how many times the reference list is modified, “Smith and Jones (2015)” remains exactly that. If there are two or more “Smith and Jones (2015)” references, the problem is easily handled by listing the first as “Smith and Jones (2015a),” the second as “Smith and Jones (2015b),” and so on. The disadvantages of name and year relate to readers and publishers. The disadvantage to the reader occurs when (often in the introduc­tion) many references must be cited within one sentence or paragraph. Some­times the reader must jump over several lines of parenthetical references before he or she can again pick up the text. Even two or three references, cited together, can distract the reader. The disadvantage to the publisher is obvious: increased cost. When “Higginbotham, Hernandez, and Chowdhary (2015)” can be con­verted to “(7),” printing costs can be reduced.

Because some papers are written by an unwieldy number of authors, most journals that use name and year have an “et al.” (meaning “and others”) rule. Commonly, it works as follows. Names are always used in citing papers with either one or two authors; for example, “Smith (2015),” “Smith and Jones (2015).” If the paper has three authors, list all three the first time the paper is cited, for example, “Smith, Jones, and Nguyen (2015).” If the same paper is cited again, it can be shorted to “Smith et al. (2015).” When a cited paper has four or more authors, it should be cited as “Smith et al. (2015)” even in the first citation. In the references section, some journals prefer that all authors be listed (no matter how many); other journals cite only the first three authors and follow with “et al.”

4.2. Alphabet-Number System

This system, citation by number from an alphabetized list of references, is a modification of the name and year system. Citation by numbers keeps print­ing expenses within bounds; the alphabetized list, particularly if it is long, is relatively easy for authors to prepare and readers (especially librarians) to use.

Some authors who have habitually used name and year tend to dislike the alphabet-number system, claiming the citation of numbers cheats the reader. The reader should be told, the argument goes, the name of the person associated with the phenomenon; sometimes, the reader should also be told the date, on the grounds that a 1914 reference might be viewed differently than a 2014 reference.

Fortunately, these arguments can be overcome. As you cite references in the text, decide whether names or dates are important. If they are not (as is usually the case), use only the reference number: “Pretyrosine is quantitatively converted to phenylalanine under these conditions (13).” Ifyou want to feature the name of the author, do it within the context of the sentence: “The role of the carotid sinus in the regulation of respiration was discovered by Heymans (13).” If you want to feature the date, you can also do that within the sentence: “Strep­tomycin was first used in the treatment of tuberculosis in 1945 (13).”

4.3. Citation Order System

The citation order system is simply a system of citing the references (by num­ber) in the order in which they appear in the paper. This system avoids the substantial printing expense of the name and year system, and readers often like it because they can quickly refer to the references, if they so desire, in one-two-three order as they come to them in the text. It is a useful system for a journal that is basically a “note” journal, each paper containing only a few references. For long papers, with many references, citation order might not be a good system. It might not be good for the author because of the substantial renumbering chore that can result from adding or deleting references. It might not be ideal for the reader, because the non-alphabetical presentation of the reference list may result in separation of various references to works by the same author.

The first edition of this book (Day 1979, p. 40) stated that the alphabet- number system “seems to be slowly gaining ascendancy.” Soon thereafter, however, the first version of the “Uniform Requirements for Manuscripts Sub­mitted to Biomedical Journals” appeared, advocating the citation order system for the cooperating journals. Several hundred biomedical journals have adopted the “Uniform Requirements,” which have evolved over the years and have now been retitled “Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly Work in Medical Journals” (International Committee of Medical Journal Editors 2014). Thus, it is not now clear which citation sys­tem, if any, will gain ascendancy. The “Uniform Requirements” document, as it still is often known, is impressive in so many ways that it has long had a powerful impact. It is in substantial agreement with a standard prepared by the American National Standards Institute (1977). With regard to literature cita­tion, however, other usage also remains strong.

5. TITLES AND INCLUSIVE PAGES

Should article titles be given in references? Normally, you must follow the style of the journal; if the journal allows a choice (and some do), we recommend that you give complete references. By denoting the overall subjects, the article titles make it simple for interested readers (and librarians) to decide whether they need to consult none, some, or all of the cited references.

The use of inclusive pagination (first and last page numbers) makes it easy for potential users to distinguish between one-page notes and 50-page review articles. Users may wish to proceed differently depending on the number of pages involved.

6. JOURNAL ABBREVIATIONS

Although journal styles vary widely, one aspect of reference citation has been standardized: abbreviations of journal names. As the result of widespread adoption of a standard (American National Standards Institute 1969), almost all of the major journals and secondary services now use the same system of abbreviation. Previously, most journals abbreviated journal names (significant printing expense can be avoided by abbreviation), but there was no unifor­mity. The Journal of the American Chemical Society was variously abbreviated to “J. Amer. Chem. Soc.,” “Jour. Am. Chem. Soc.,” “J.A.C.S.,” and so forth. These differing systems posed problems for authors and publishers alike. Now there is essentially only one system, and it is uniform. The word “Journal” is now always abbreviated “J.” (Some journals omit the periods after the abbreviations.) By noting a few of the rules, authors can abbreviate many journal titles, even unfa­miliar ones, without referring to a source list. It is helpful to know, for example, that all “ology” words are abbreviated at the “l.” (“Bacteriology” is abbreviated “Bacteriol.”; “Physiology” is abbreviated “Physiol.,” etc.) Thus, if one memo­rizes the abbreviations of words commonly used in titles, most journal titles can be abbreviated with ease. An exception to remember is that one-word titles (Science, Biochemistry) are never abbreviated.

Appendix 1 lists the abbreviations for commonly used words in periodical titles. If you are unsure how to abbreviate a journal title, you can often discern the correct abbreviation from a listing in a bibliographic database, from infor­mation in the journal, or from a previous citation of the journal. Abbreviations for the titles of many journals in the biomedical sciences and related fields can be obtained from the PubMed journals database (www.ncbi.nlm.nih.gov/nlm catalog/journals).

7. SOME TRENDS IN REFERENCE FORMAT

Not all journals abbreviate journal titles in references. For example, APA style (Publication Manual of the American Psychological Association 2010, p. 185) calls for stating periodical titles in full. More generally, journals may increasingly be including full journal titles in references. Earlier, when journals appeared only in print, publishers favored abbreviating journal titles because it saved valu­able space, thus saving paper costs or allowing more papers to be published. Today, with many journals appearing mainly or solely online, the space saved may be less of a consideration than are convenience to authors and clarity to readers. Writing out journal titles in full may serve especially well in journals that publish interdisciplinary papers and thus have readers who might not understand the abbreviations of some words in the titles of cited journals.

If a journal article has been published online, either exclusively or as well as in print, the publisher may have assigned it a Digital Object Identifier (DOI), which specifies a persistent link to its location on the Internet. If an article has a DOI, commonly it appears on the first page. Some reference formats include providing the DOI, if one exists, at the end of the reference. Additional infor­mation about DOIs is available at www.doi.org.

8. EXAMPLES OF DIFFERENT REFERENCE STYLES

So that you can see at a glance the differences among the three main systems of referencing, here are three sample references as they might appear in the references section of a journal. (In some journals, references in these systems will look somewhat different from those below because journals differ among themselves in items such as how, if at all, they use italics and boldface in refer­ences.)

8.1. Name and Year System

Alvarez GA, Suter D, and Kaiser R. 2015. Localization-delocalization transi­tion in the dynamics of dipolar-coupled nuclear spins. Science 349:846­848.

Bern C. 2015. Chagas’ disease. N. Engl. J. Med. 373:456-466.

Shipman WM. 2015. Handbook for science public information officers. Chicago: University of Chicago Press.

8.2. Alphabet-Number System

• Alvarez, G. A., D. Suter, and R. Kaiser. 2015. Localization-delocalization transition in the dynamics of dipolar-coupled nuclear spins. Science 349:846-848.
• Bern, C. 2015. Chagas’ disease. N. Engl. J. Med. 373:456-466.
• Shipman, W. M. 2015. Handbook for science public information officers. Chicago: University of Chicago Press.

8.3. Citation Order System

• Bern C. Chagas’ disease. N Engl J Med. 2015;373:456-66.
• Shipman WM. Handbook for science public information officers. Chicago: University of Chicago Press, 2015.
• Alvarez GA, Suter D, Kaiser R. Localization-delocalization transition in the dynamics of dipolar-coupled nuclear spins. Science. 2015;349:846-48.

In addition to its non-alphabetical arrangement of references, the citation order system differs from the others in its advocacy of eliminating periods after abbreviations (of journal titles, for example), periods after authors’ initials, and commas after authors’ surnames.

9. CITING ELECTRONIC MATERIAL

The Internet increasingly contains material appropriate for citation. In partic­ular, many scientific papers now are appearing in electronic journals or being posted online as well as appearing in print. In addition, some reports, databases, and other items accessed online can be valid to cite.

Accordingly, formats have been developed, and are continuing to be devel­oped, for citing electronic materials. These formats appear in recent editions of style manuals and in the instructions to authors of some journals. If you wish to cite electronic material, begin by consulting the instructions to authors of your target journal. These instructions may show the format(s) to use or direct you to a source of guidance in print or online. Also, you may find it useful to look in the journal for examples of references listing electronic materials.

10. ONE MORE REASON TO CITE CAREFULLY

Accurate citation is part of being a rigorous researcher. Whether you use refer­ence management software or prepare references by traditional means, ensure that the right reference is cited in the right place, that all information in every citation is accurate, and that content from the cited sources is accurately reported. Such accuracy is important in ensuring that your paper is useful to readers.

And, on a very practical note, careful citation helps keep you from alienating those evaluating your paper. Commonly, some of the referees (peer reviewers) chosen by editors are researchers whose work your paper cites. If your refer­ence section lists their writings inaccurately, or if your text misrepresents their findings or conclusions, they might well question whether you are a careful researcher.

So, take the same care with your references that you do with other aspects of your work. The effort is likely to serve you well.

Source: Gastel Barbara, Day Robert A. (2016), How to Write and Publish a Scientific Paper , Greenwood; 8th edition.

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Computer Science > Computation and Language

Title: understanding emergent abilities of language models from the loss perspective.

Abstract: Recent studies have put into question the belief that emergent abilities in language models are exclusive to large models. This skepticism arises from two observations: 1) smaller models can also exhibit high performance on emergent abilities and 2) there is doubt on the discontinuous metrics used to measure these abilities. In this paper, we propose to study emergent abilities in the lens of pre-training loss, instead of model size or training compute. We demonstrate that the models with the same pre-training loss, but different model and data sizes, generate the same performance on various downstream tasks. We also discover that a model exhibits emergent abilities on certain tasks -- regardless of the continuity of metrics -- when its pre-training loss falls below a specific threshold. Before reaching this threshold, its performance remains at the level of random guessing. This inspires us to redefine emergent abilities as those that manifest in models with lower pre-training losses, highlighting that these abilities cannot be predicted by merely extrapolating the performance trends of models with higher pre-training losses.

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