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How To Cite a Research Paper for 2026: Citation Styles Guide

Imed Bouchrika, Phd

by Imed Bouchrika, Phd

Co-Founder and Chief Data Scientist

If you are looking for the best advice on how to write a research paper, the first thing you would find is to cite your sources. In academic research, it is standardized by many institutions. And, publication venues such as conferences and journals are somehow strict about their formats. Hence, it is best for students with PhD degrees and aspiring researchers to know how to cite a research paper and other sources in their works. Citing your sources properly is also important for many reasons. One of the most important ones is that you can easily establish to your reviewers and readers the context around and relevancy of your work.

But, creating a reference section for your paper or dissertation can be a tedious task. As such, this article should serve as your guide on how to reference a research paper in popular formats: APA, MLA, Chicago/Turabian, and the IEEE style. A list of digital tools that can make citation easier and a quick tutorial will also be provided. This way, you can concentrate more on the content of your paper rather than what many consider a cumbersome task.

How To Cite a Research Paper Table of Contents

  1. The Rationale Behind Citations
  2. APA Style Citation Guide
  3. MLA Style Citation Guide
  4. Chicago/Turabian Style Citation Guide
  5. IEEE Style Citation Guide
  6. Common Mistakes to Avoid When Citing Research Papers
  7. How Can an Effective Citation Strategy Propel Your Academic Career?
  8. How Can You Evaluate the Credibility of Your Sources?
  9. How Do Evolving Citation Standards Impact Your Research?
  10. Tools and Strategies for Streamlining Citation Practices
  11. Can Self-Paced Online Courses Improve Your Citation Proficiency?
  12. The Role of Citations in Enhancing Research Visibility and Credibility
  13. Can Intensive Academic Programs Enhance Your Citation Accuracy?
  14. How Do Copyright Considerations Affect Citation Practices?

The Rationale Behind Citations

The main reason for citing references properly is to avoid intellectual dishonesty (Bast & Samuels, 2008). Presenting ideas of other scholars without proper research paper citation goes against scientific ethics (Gross, 2016). While this is not the highest of ethical requirements, it is simply basic decency. This is because we humans have a strong sense of ownership, not just of our physical properties but also of our intellectual works and achievements. We have a strong drive to know who or where exactly pieces of information came from and how ideas develop. Thus it is important to know how to give reference in a research paper.

In research, this is very apparent in literature where scholars discuss and debate who first created a research methodology, an idea, or made a discovery (e.g., Newton versus Leibniz for calculus and Le Verrier versus Adams for Neptune).

A free plagiarism checker for students does not make the cut. You must properly reference a source even if you have reworded the idea you lifted from it. Properly referencing a source is not only important that the right people get the proper recognition for their ideas. It is also crucial to the whole research publication and consumption process for the following reasons:

  1. To Avoid Plagiarism Citations allow researchers to properly quote the work of others. It helps them acknowledge where the information came from.
  2. Respect for Intellectual Property Rights Research work can include industry information legally protected by intellectual property rights. These include trademarks, patents, industrial designs, and geographical indications. Creative works for entertainment are also included, ranging from films to architectural designs.
  3. To Provide Evidence  Citing studies and data properly allows you to provide evidence for key points of your work. This is especially important when making a case for a position you take.
  4. To Give Details on Source Documents Citations make it easier for reviewers to check for data and even the line of arguments. Also, it helps direct the readers to original sources where they can find more detailed information about the point you cited and the subject matter.

Overall, referencing helps research communities place a work in its proper context to better judge its potential impact on its field.

There are many different fields and disciplines in the research world. And, they have different styles and standards for what proper referencing is. Rules also vary from the types of sources you cite, including but not limited to research papers, technical reports, books, patents, court cases, conference journals, conference papers,  podcasts, YouTube videos, and social media posts. But, most styles have common elements on how to write references in a research paper.

Basic Citation Elements

  • Author(s)
  • Title(s)
  • Source or venue name (e.g. name of the journal  it was published or conference where it was presented)
  • Editor(s)
  • Volume and edition
  • Date or year of publication
  • Page numbers
  • City and country
  • Publisher or university for theses
  • URL for online sources
  • DOI
  • Retrieval date for online sources with dynamic content subjected to change

Aside from the above mentioned, it’s important to note that there are two aspects to consider on how to write a citation in a research paper: in-text and the reference list section. In-text citations are included in the body of your work. These are also repeated but in more detail in the reference list usually situated after your article. Different levels of styles have different ways to cite works. However, they usually include the critical information listed above.

Furthermore, the choice of citation styles or formats largely depends on your discipline, your institution, and other venues for publication (e.g., journals and conferences). So, it is best to check your target venue for submission for its preferred citation style. It is also good to note that some have specific style preferences, apart from the popular formats (e.g. APA, MLA, Chicago, and IEEE). Hence, it is best to check the author’s instructions page on their websites and articles that have already been published for reference.

Appropriate Level of Citation: Undercitation, Overcitation, and Unethical Citations

Just like most things, citation in research should be done in a reasonable amount. You must avoid undercitation and overcitation. The former is when you miss out to cite a source while the latter is when you put unnecessary citations that can be too distracting (Appropriate Level of Citation, n.d.). By citing all utilized sources used and giving proper credit to actual authors, scholarly writers do not only prevent plagiarism but also show that they have conducted extensive research, are well-informed about the study subject, and their research is reliable (Truluck & Richardson, 2013).

In this section on how to make citations in research, we will discuss when you must cite a source and how to avoid overcitation.

When to Cite a Source

The components in a citation or reference entry are devised to allow the reader to identify or locate the specific source that is cited (Lanning, 2016). Whenever you use another individual’s work, you really must cite a source. Forgetting to or intentionally not doing so can lead to a serious dent on your reputation. Thus, remember to cite properly when you:

  • Quote the exact words of authors
  • Paraphrase or state the ideas of others in your own words
  • Refer to data or data sets
  • Reprint a long text passage or a copyrighted test item
  • Reprint or adopt a figure or a table, including free images and diagrams from the internet even when free or licensed via Creative Commons

When writers fail to cite their sources, they commit undercitation, as the APA (n.d.) calls it. This leads to plagiarism. This is really frowned upon not just in the academic research community. It is also a no-no in every type of publication, from films to music. So, it is best to be really thorough in collecting and referencing your sources. Learning how to cite papers is simple. But, you also have to be careful not to be too thorough. Too much care or fear of undercitation can lead to overdoing them.

Putting more citations than required is called overcitation. This is also frowned upon but to a somewhat lesser extent. The reasoning here is that when you place inappropriate amounts of citations, it can be quite distracting for readers. This is especially true when dealing with in-text citations. Readers and reviewers will find it difficult to follow the thoughts and arguments in your paper if they are constantly getting interrupted by unnecessary in-text citations. It can really become annoying. The key to writing a coherent research paper lies in knowing how to cite a study and when to add in-text citations.

Overcitation usually happens when writers repeat the same citation in every sentence even though the topic and source have not changed at all. To avoid overdoing citations when paraphrasing, remember to place a citation for a key point in a paragraph only in the first sentence where it is relevant. Do not repeat the citation when the source of the material remains clear and the same.

Moreover, overcitation can also be very unethical especially when a writer cites a source as evidence even when the source does not really count as one. This unethical practice usually happens when a writer cites a study or dataset to support a claim but when reviewers and readers go through the source, they would find it not to be valid evidence for the writer’s claim. Sometimes, this can happen unintentionally, especially when a writer misunderstands what was cited or the implications of the information cited. But, there can be instances when there is malicious intent to boost the credits of a claim by beefing up cited works. This must be avoided at all costs.

Furthermore, it is highly discouraged for writers to cite themselves especially when their works are unrelated. It may be quite tempting to cite your work or your colleagues’ to boost your profiles or publications. But, this should be avoided to keep the integrity of the current work. Reviewers and other researchers are able to recognize self-promotion when they see it. Keep in the context of the work and keep unrelated stuff and self-promotion out of it.

In the next few sections, we’ll provide basic guides on how to cite various sources using four popular citation formats: (1) APA, (2) MLA, (3) Chicago/Turabian, and (4) IEEE.

APA Style Citation Guide

APA stands for American Psychological Association. The APA style for citation is popular among behavioral and social science journals. However, it is not limited to such disciplines. The style originated in 1929, created by a group of psychologists, anthropologists, and business managers to improve reading comprehension (University of Pittsburgh, 2020). The citation style has undergone many changes throughout the years.

The latest version is the APA 7th edition published in October 2019. This section draws from the APA official Style and Grammar Guidelines (American Psychological Association, n.d.).

The guidelines on how to add references in a research paper, including in-text citation, formatting of the reference list, or bibliography section are explained in this section.

APA In-Text Citation

In-text citations let users know which ideas are attributed to whom. The APA citation style has two major elements for in-text citation: the author and the date. Also, they come in two forms: parenthetical and narrative (APA, 2019).

Parenthetical Citations

For parenthetical citations, both author and date appear separated by a comma. A parenthetical citation may appear within or at the end of a sentence.

  • …98% of participants (Smith, 2014).

Should other texts appear within the parenthetical citation, one should use commas around the year.

  • …however old the findings may be (see Bishop, 1996, for further explanation).

If both text and citation are included in parentheses, use a semicolon to separate them. Never use parentheses within parentheses.

  • …(e.g., experimental anomalies in clinical trials; Chan, 2015).

Narrative Citations

In narrative citations, the author’s last name appears in the running text while the date appears in parentheses after it. The author’s name can be placed in any part of the sentence that makes sense.

  • Yang (2004) suggested that…

In cases where both the author and date element appear in the running text, do not use parentheses.

  • In 2004, Yang concluded that…

Citations by the Number of Authors

For a single author 

  • Coleman (2019) stated that early…
  • …hominids hunted large game (Coleman, 2019).

For two authors

  • Smith and Johnson (2020) avoided the term…
  • …paradigm because of its use in ordinary language (Smith & Johnson, 2020).

For three to five authors

  • Use the last name of the first author and “et al." even for the first citation: …especially when observers are involved (James et al., 2017).
  • …especially when observers are involved (James et al., 2017).

For six or more authors

  • Cite only the name of the first author, use et al., and the year: …for complex adaptive systems (Chambers et al., 2019).
  • …for complex adaptive systems (Chambers et al., 2019).
  • Chambers et al. (2010) put forward a model…

If the author information is not available, you can use the source title to replace the author element. When there is no date included in the source, cite the first few words of the article inside quotation marks using a headline-style capitalization with the year after the comma in your in-text citation in the form:

  • (“No Author, No Date," n.d.).

APA Reference List Entries Format

For the reference lists located at the end of the research paper, you need to cite four major elements:

  1. Author: includes the individual author names format and group author names format
  2. Date: includes the date format and how to include retrieval dates
  3. Title: includes the title format and how to include bracketed descriptions
  4. Source: includes the source format and how to include database information

Below are the APA style rules for each of them.

MLA Style Citation Guide

MLA is short for the Modern Language Association based in the U.S. The MLA style is used worldwide and is popularly used in the humanities. The latest version is the 8th edition published in 2016. And, just like APA, it has in-text citation and reference list rules. However, when you use the MLA format, you use the title “Works-Cited List" for your reference list. In this section, the rules for both in-text citation and the works-cited list will be discussed.

MLA In-Text Citation

The MLA in-text citations have two elements: the author’s surname and the page or page-range where the reference is found. MLA style in-text citations also come in two forms: parenthetical and narrative. Also, they are usually inserted immediately after a quote or parenthetical or in a natural pause. In-text references are used to reference works that you quote or paraphrase from. The latest version is the MLA 8th edition (Mendeley, 2019).

  • Parenthetical: (Handel 354)
  • Narrative: Handel suggested that…(354).

If there are more two to three authors, they should be cited in the following format.

  • (Kwan, Yang, and Connor 238)

For more than three authors, you only include the surname of the first author followed by “et al." such as:

  • (Kwan et al. 238)

If there are no authors, you should italicize the whole title for books. For articles, you enclose the title in quotations. Also, you can use a shortened title within quotation marks instead of the author’s name.

  • For booksThe Birdwatching Handbook  shows “…" (123)   or (The Birdwatching Handbook 123)
  • For articles: “Theoretical Foundations of Birdwatching" states “…" or (“Theoretical Foundations of Birdwatching" 123).

For authors with multiple cited works, include a shortened version of the title within the citation.

  • (Kwan, Theoretical Foundations of Birdwatching 123)

In cases where authors have the same surnames, you should include an initial to differentiate.

  • (Y. Kwan 123) and (J. Kwan 9)

If there are no page numbers, then include the number pattern included in the book like chapters or paragraphs. If there are no numbered sections, then only the name should be included.

  • No page number, with chapters: (Kwan, ch. 9)
  • No number pattern: (James)

When citing a quote or a parenthetical, use “qtd." before the author’s name.

  • (qtd. In Kwan 123)

Also, when citing audio-visual sources, use a timestamp instead of a page number. The format should be in “hh:mm:ss".

  • (Johnson 01:15:22)

References:

  1. APA (2009, May). How do you cite website material that has no author, no year, and no page numbers? APA Style. Washington, DC: American Psychological Association.
  2. APA (2019, September). Appropriate level of citation. APA Style. Washington, DC: American Psychological Association.
  3. APA (2020). Style and grammar guidelines. APA Style. Washington, DC: American Psychological Association.
  4. Bast, C. M., & Samuels, L. B. (2008). Plagiarism and legal scholarship in the age of information sharing: the need for intellectual honesty. Catholic University Law Review57 (3), 777-815. https://scholarship.law.edu/cgi/viewcontent.cgi?article=1077&context=lawreview
  5. Gross, C. (2016). Scientific misconduct. Annual Review of Psychology, 67, 693-711. https://doi.org/10.1146/annurev-psych-122414-033437
  6. Lanning, S. (2016). A modern, simplified citation style and student response. Reference Services Review, 44 (1), 21-37. https://doi.org/10.1108/RSR-10-2015-0045
  7. IEEE (n.d.). How to Cite References: IEEE Documentation Style. IEEE DataPort.
  8. Mendeley. (2019). How to cite sources in MLA citation format. Mendeley.
  9. Truluck, C., & Richardson, D. (2013). Citing sources correctly. Radiologic Technology, 84 (3), 311-316. https://www.radiologictechnology.org/content/84/3/311.extract
  10. University of Chicago Press (2017a). The Chicago Manual of Style, 17th edition. The Chicago Manual of Style Online.
  11. University of Chicago Press (2017b). Notes and bibliography: Sample citations. Turabian: A Manual for Writers.
  12. University of Chicago Press (2017c). Author-date: Sample citations. Turabian: A Manual for Writers.
  13. University of Pittsburgh. (2020, January 28). LibGuides: Citation styles: APA, MLA, Chicago, Turabian, IEEE: APA 6th edition. LibGuides at University of Pittsburgh.

Other Things You Should Know About How To Cite a Research Paper

Why is citing sources important in research?

Citing sources is crucial for preventing plagiarism, giving proper credit to original authors, and providing evidence and context for your research. It helps readers trace the origin of ideas and assess the validity and relevance of your work.

What are the common elements included in a citation?

Common citation elements include the author's name, title of the work, publication year, volume and issue numbers (for articles), page numbers, and URLs or DOIs for online sources. Specific requirements vary by citation style.

How do APA and MLA citation styles differ in in-text citations?

APA in-text citations include the author's last name and the publication year (e.g., Smith, 2020). MLA in-text citations include the author's last name and the page number (e.g., Smith 123). APA focuses on the date to emphasize the currency of research, while MLA focuses on the location of the cited information within the source.

What should I do to avoid overcitation?

To avoid overcitation, ensure that you only cite a source once per paragraph unless the source is integral to multiple points. Avoid repeating citations unnecessarily within the same context, and ensure that each citation adds value to your argument.

What is the difference between footnotes and endnotes in Chicago style?

Footnotes appear at the bottom of the page where the citation is made, while endnotes appear at the end of a chapter or document. Both are used in the notes and bibliography style of Chicago to provide detailed citation information corresponding to superscript numbers in the text.

When should I use a bibliography generator?

A bibliography generator can be useful for quickly creating citation lists and ensuring proper formatting. However, it is essential to understand manual citation rules to verify the accuracy of generated citations and make necessary adjustments.

Can I cite my own previous work in a new research paper?

Yes, you can cite your previous work if it is relevant to your current research. However, avoid excessive self-citation as it can be seen as self-promotion and may detract from the credibility of your current work. Ensure that the cited work directly contributes to your new research.

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