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APA Citation Style Guide: The Complete Reference for Students and Researchers

APA (American Psychological Association) style uses an author-date citation system requiring in-text citations (Author, Year) and a corresponding reference list. This comprehensive guide covers APA 7th edition rules for every source type, with copy-paste examples, common mistakes to avoid, and formatting templates.

Table of Contents

  1. What is APA Style?
  2. APA 7th vs. 6th Edition: Key Differences
  3. In-Text Citations: Complete Guide
  4. Reference List Formatting Rules
  5. How to Cite Every Source Type
  6. APA Paper Format Requirements
  7. Common APA Mistakes (and How to Avoid Them)
  8. APA Citation Tools and Generators
  9. Quick Reference Tables
  10. Annotated Bibliography Format

What is APA Style?

APA (American Psychological Association) style is a comprehensive set of guidelines for academic writing and source citation. First published in 1929 as a seven-page article in Psychological Bulletin, it has expanded into the Publication Manual of the American Psychological Association, now in its 7th edition (2020).

Who Uses APA Style?

APA is the dominant citation style in:

  • Psychology and behavioral sciences
  • Education and educational research
  • Social sciences (sociology, political science, communication)
  • Business and management
  • Nursing and public health
  • Criminology and social work
  • Economics and many interdisciplinary fields

If your professor or journal says “use APA,” they mean APA 7th edition unless explicitly stated otherwise.

APA 7th vs. 6th Edition: Key Differences

Feature APA 6th Edition APA 7th Edition
In-text (3+ authors) List all authors up to 5 on first mention Use “et al.” from the first citation
Reference list authors Include up to 7, then “…” Include up to 20, then “…”
DOI format doi:10.xxxx/xxxxx https://doi.org/10.xxxx/xxxxx
Publisher location Required (New York, NY: Publisher) Not required (just Publisher)
Running head Required on all papers Only required for professional manuscripts
Font Times New Roman, 12pt only Multiple fonts accepted
Bold heading for Level 3 Not bold Bold and italic
URLs Preceded by “Retrieved from” Just the URL (no “Retrieved from” unless content may change)

Getting APA citations right is tedious. One misplaced comma, a missing DOI, or the wrong “et al.” rule can trigger a desk rejection or cost you marks.

In-Text Citations: Complete Guide

APA uses the author-date system. Every claim, idea, or finding you take from a source gets an in-text citation that points the reader to the full reference in your reference list.

One Author

Parenthetical:

Research shows that sleep deprivation impairs cognitive function (Walker, 2017).

Narrative:

Walker (2017) demonstrated that sleep deprivation impairs cognitive function.

Two Authors

Use an ampersand (&) in parenthetical citations and “and” in narrative citations:

Parenthetical:

Emotional regulation develops through social interaction (Gross & Thompson, 2007).

Narrative:

Gross and Thompson (2007) argued that emotional regulation develops through social interaction.

Three or More Authors

In APA 7th edition, use “et al.” from the first citation onward for any work with three or more authors:

Parenthetical:

Team diversity improves problem-solving outcomes (Johnson et al., 2021).

Narrative:

Johnson et al. (2021) found that team diversity improves problem-solving outcomes.

⚠️ This is one of the biggest changes from the 6th edition, which required listing all authors (up to five) on first mention.

No Author

Move the title to the author position. Use quotation marks for article titles and italics for book/report titles:

Article:

The rate of diagnosis has increased significantly (“New Findings in ADHD,” 2022).

Book/Report:

The report outlines three priorities (Global Education Monitoring Report, 2023).

Multiple Works by the Same Author in the Same Year

Append lowercase letters (a, b, c) to the year:

Early studies established the framework (Patel, 2019a), while later work expanded it (Patel, 2019b).

Both entries appear in your reference list with the matching year-letter combination, ordered alphabetically by title.

Multiple Sources in One Citation

Separate sources with semicolons and list alphabetically by first author:

Several studies support this conclusion (Adams, 2018; Chen & Liu, 2020; Thompson et al., 2019).

Direct Quotes

For direct quotations, include the page number (or paragraph number for sources without pages):

Short quote (under 40 words):

Walker (2017) defined the phenomenon as “a measurable decline in executive function following even moderate sleep loss” (p. 142).

Long quote (40+ words): Block quote, indented 0.5 inches, no quotation marks:

Walker (2017) described the broader implications:

Sleep deprivation affects not only individual cognitive performance but also collective decision-making in organizational settings. Teams composed of sleep-deprived members showed a 30% decrease in creative output compared to well-rested controls. (p. 156)

Paraphrasing

When paraphrasing, page numbers are encouraged but not required:

Sleep loss reduces both individual performance and group creativity, with measurable impacts on team output (Walker, 2017).

You do not need quotation marks for paraphrased content, but you still need the citation.

Reference List Formatting Rules

The reference list appears at the end of your paper on a new page. It provides full publication details for every source cited in the text.

General Formatting Rules

  • Heading: Center the word “References” in bold at the top of the page
  • Spacing: Double-space all entries (no extra space between entries)
  • Hanging indent: First line flush left, subsequent lines indented 0.5 inches
  • Alphabetical order: By the first author’s last name
  • Only cited sources: Include only works you actually cited in your text

Author Name Format

  • Last name first: Smith, J. A.
  • Initials only: Use first and middle initials, not full first names
  • Multiple authors: Use commas between authors and an ampersand (&) before the last author
  • Up to 20 authors: List all of them
  • 21+ authors: List the first 19, then an ellipsis (…), then the last author

Date Format

  • Journal article: (2024).
  • Book: (2023).
  • Webpage with exact date: (2024, March 15).
  • No date: (n.d.).

Italicization Rules

  • Italicize: Book titles, journal names, volume numbers, report titles
  • Do not italicize: Article titles, chapter titles, webpage titles

How to Cite Every Source Type

Journal Articles

Journal Article with DOI:

Mitchell, R., & Chen, L. (2023). Cognitive load theory in virtual learning environments. Educational Psychology Review, 35 (2), 145–167. https://doi.org/10.1007/s10648-023-09812-3

Journal Article without DOI (Print):

Richardson, T. A. (2022). Community resilience after natural disasters. Journal of Community Psychology, 50 (4), 312–329.

Journal Article without DOI (Accessed Online):

Richardson, T. A. (2022). Community resilience after natural disasters. Journal of Community Psychology, 50 (4), 312–329. https://www.journalofcommpsych.org/article/2022-312

Multiple Authors (2–20 Authors):

Adams, K., Brown, R., Carter, D., Davis, E., & Evans, F. (2024). Machine learning applications in behavioral science. Psychological Methods, 29 (1), 22–41. https://doi.org/10.1037/met0000612

More Than 20 Authors:

Wang, A., Chen, B., Diaz, C., Edwards, D., Fujita, E., Garcia, F., Huang, G., Ibrahim, H., Jensen, I., Kim, J., Lee, K., Martinez, L., Nakamura, M., Olsen, N., Park, O., Quinn, P., Rossi, Q., Singh, R., Torres, S.,… Zhou, Z. (2025). Large-scale analysis of neural correlates. Nature Neuroscience, 28 (3), 401–419. https://doi.org/10.1038/s41593-025-01234-5

Advance Online Publication:

Patel, S., & Nguyen, T. (2025). Mindfulness interventions for workplace burnout. Journal of Occupational Health Psychology. Advance online publication. https://doi.org/10.1037/ocp0000398

Books

General format:

Author, A. A. (Year). Title of work: Capital letter also for subtitle. Publisher. https://doi.org/xxxxx

Note: In APA 7th edition, you no longer include the publisher’s location.

Single Author:

Kahneman, D. (2011). Thinking, fast and slow. Farrar, Straus and Giroux.

Multiple Authors:

Schwartz, B., & Sharpe, K. (2010). Practical wisdom: The right way to do the right thing. Riverhead Books.

Edited Book:

Gross, J. J. (Ed.). (2014). Handbook of emotion regulation (2nd ed.). Guilford Press.

Chapter in an Edited Book:

Author, A. A. (Year). Title of chapter. In E. E. Editor (Ed.), Title of book (pp. xx–xx). Publisher. https://doi.org/xxxxx

Baumeister, R. F. (2014). Self-regulation, ego depletion, and inhibition. In J. J. Gross (Ed.), Handbook of emotion regulation (2nd ed., pp. 408–426). Guilford Press.

E-Book with DOI:

Brown, B. (2018). Dare to lead: Brave work. Tough conversations. Whole hearts. Random House. https://doi.org/10.1234/example

E-Book without DOI (from a Database):

Brown, B. (2018). Dare to lead: Brave work. Tough conversations. Whole hearts. Random House.

If the e-book is from an academic database (e.g., EBSCO, ProQuest), do not include a URL or database name.

Translated Book:

Piaget, J. (1959). The language and thought of the child (M. Gabain, Trans.; 3rd ed.). Routledge. (Original work published 1926)

In-text citation: (Piaget, 1926/1959)

Book Edition Other Than the First:

American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.). American Psychiatric Association Publishing. https://doi.org/10.1176/appi.books.9780890425787

Websites

Webpage with Individual Author:

Price, M. (2024, January 10). The science of procrastination. Psychology Today. https://www.psychologytoday.com/articles/procrastination

Webpage with Organization as Author:

When the organization is also the site name, omit the site name to avoid repetition:

World Health Organization. (2024, March 15). Mental health and COVID-19. https://www.who.int/news-room/mental-health-covid-19

Webpage with No Author:

Move the title to the author position:

How to apply for federal student aid. (2024, August 1). Federal Student Aid. https://studentaid.gov/apply

Webpage with No Date:

Use “n.d.” (no date):

National Institute of Mental Health. (n.d.). Anxiety disorders. https://www.nimh.nih.gov/health/topics/anxiety-disorders

Webpage vs. Entire Website:

If you reference an entire website (not a specific page), provide the URL in the text and do not include a reference list entry:

The CDC provides public health data (https://www.cdc.gov).

Only create a reference entry when citing a specific page or document on a website.

Other Common Source Types

Conference Paper or Presentation:

Lee, H., & Park, J. (2023, August 10–13). Deep learning for sentiment analysis in multilingual corpora [Conference paper]. Annual Meeting of the Association for Computational Linguistics, Toronto, Canada.

Unpublished Conference Paper:

Garcia, M. (2024, April 4–7). Resilience factors in refugee populations [Paper presentation]. Society for Research on Adolescence Biennial Meeting, Chicago, IL, United States.

Doctoral Dissertation (from a Database):

Williams, S. R. (2023). Predictors of teacher burnout in urban school districts [Doctoral dissertation, University of Michigan]. ProQuest Dissertations & Theses Global.

Master’s Thesis:

Hernandez, A. (2022). Social media and adolescent self-esteem: A longitudinal study [Master’s thesis, Boston University]. OpenBU. https://open.bu.edu/handle/xxxxx

Government Report:

National Center for Education Statistics. (2024). Digest of education statistics, 2023 (NCES 2024-009). U.S. Department of Education. https://nces.ed.gov/programs/digest/

Newspaper Article (Online):

Kolata, G. (2024, February 12). New research challenges long-held assumptions about Alzheimer’s disease. The New York Times. https://www.nytimes.com/2024/02/12/health/alzheimers-research.html

Social Media: Twitter/X Post:

American Psychological Association [@APA]. (2024, March 5). New research shows that brief mindfulness exercises can reduce test anxiety by up to 25% [Tweet]. Twitter. https://twitter.com/APA/status/1234567890

YouTube Video:

TED. (2019, April 15). The danger of a single story | Chimamanda Ngozi Adichie [Video]. YouTube. https://www.youtube.com/watch?v=D9Ihs241zeg

If the uploader’s real name is known:

Adichie, C. N. [TED]. (2019, April 15). The danger of a single story [Video]. YouTube. https://www.youtube.com/watch?v=D9Ihs241zeg

Podcast Episode:

Vedantam, S. (Host). (2024, January 22). The power of conformity (No. 287) [Audio podcast episode]. In Hidden Brain. NPR. https://hiddenbrain.org/podcast/conformity

Podcast Series:

Vedantam, S. (Host). (2015–present). Hidden Brain [Audio podcast]. NPR. https://hiddenbrain.org

Personal Interview:

Personal interviews are not included in the reference list because they are not recoverable data. Cite them only in-text:

(J. A. Rodriguez, personal communication, March 10, 2024)

Dataset:

Pew Research Center. (2023). American trends panel wave 121 [Data set]. https://www.pewresearch.org/dataset/american-trends-panel-wave-121/

Software or App:

R Core Team. (2024). R: A language and environment for statistical computing (Version 4.4.0) [Computer software]. R Foundation for Statistical Computing. https://www.R-project.org/

Legal Reference (Court Case):

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

Note: Legal references follow The Bluebook format, not standard APA author-date format.

Patent:

Smith, J. A. (2023). Wearable biosensor for continuous glucose monitoring (U.S. Patent No. 11,234,567). U.S. Patent and Trademark Office. https://patents.google.com/patent/US11234567

APA Paper Format Requirements

Beyond citations, APA style dictates how your manuscript should look.

Title Page

Professional manuscript:

  • Title (bold, centered, upper half of the page)
  • Author name(s)
  • Institutional affiliation(s)
  • Course number and name (for student papers)
  • Instructor name (for student papers)
  • Assignment due date
  • Running head (professional papers only)
  • Page number (top right)

Student papers do NOT require:

  • Running head
  • Author note

Abstract

  • Labeled “Abstract” (bold, centered) on page 2
  • Single paragraph, no indentation
  • 150–250 words
  • Keywords line: Keywords: keyword1, keyword2, keyword3

Headings (Levels 1–5)

APA uses five levels of headings:

Level Format Example
1 Centered, Bold, Title Case Method
2 Flush Left, Bold, Title Case Participants
3 Flush Left, Bold Italic, Title Case Materials
4 Indented, Bold, Title Case, Period. Visual Stimuli. Text continues…
5 Indented, Bold Italic, Title Case, Period. Color Stimuli. Text continues…

Running Head

  • Required only for professional manuscripts (not student papers) in APA 7th edition
  • Abbreviated title in ALL CAPS, flush left in the header
  • Maximum 50 characters including spaces
  • Example: COGNITIVE LOAD IN VIRTUAL LEARNING

Page Numbers

  • Top right corner of every page, starting with the title page as page 1

Margins and Font

  • Margins: 1 inch (2.54 cm) on all sides
  • Fonts (any of these): 11pt Calibri, 11pt Arial, 10pt Lucida Sans Unicode, 12pt Times New Roman, 11pt Georgia, or 10pt Computer Modern (LaTeX default)
  • Line spacing: Double-spaced throughout

Common APA Mistakes (and How to Avoid Them)

1. Missing DOIs

Wrong:

Smith, J. (2023). Title of article. Journal Name, 12 (3), 45–67.

Right:

Smith, J. (2023). Title of article. Journal Name, 12 (3), 45–67. https://doi.org/10.xxxx/xxxxx

If a DOI exists, you must include it. Look up DOIs at https://www.crossref.org/guestquery/.

2. Incorrect “et al.” Usage

Wrong (using APA 6th rules):

First citation: (Johnson, Smith, Lee, Davis, & Chen, 2022) Subsequent: (Johnson et al., 2022)

Right (APA 7th edition):

All citations: (Johnson et al., 2022)

In the 7th edition, three or more authors always use “et al.” from the first citation.

3. Wrong Date Format

Wrong:

(March 15, 2024)

Right:

(2024, March 15) — in the reference list (2024) — in in-text citations (year only)

4. Missing Hanging Indent

Every reference entry must use a hanging indent. The first line is flush left; subsequent lines are indented 0.5 inches. This is the single most common formatting error in student papers.

5. Including Publisher Location

Wrong (APA 6th edition rule):

New York, NY: Penguin Books.

Right (APA 7th edition):

Penguin Books.

Publisher location was removed in the 7th edition.

6. Using “Retrieved from” Unnecessarily

Wrong:

Retrieved from https://doi.org/10.xxxx/xxxxx

Right:

https://doi.org/10.xxxx/xxxxx

Only use “Retrieved [Date] from” when the content may change over time (e.g., a wiki page or a social media profile).

7. Capitalizing Article Titles Incorrectly

In the reference list, article and book titles use sentence case (only capitalize the first word, first word after a colon, and proper nouns):

Wrong:

The Effects of Meditation on Working Memory

Right:

The effects of meditation on working memory

Note: Journal names use title case and are italicized.

8. Forgetting the Issue Number

Include the issue number in parentheses after the volume number, if available:

Incomplete:

Journal of Psychology, 45, 112–130.

Complete:

Journal of Psychology, 45 (2), 112–130.

9. Confusing Reference Types

A webpage is not a journal article. A blog post is not a report. Using the wrong template means the entire entry is formatted incorrectly. When in doubt, identify: Is this a periodical, a book, a webpage, or something else? Then use the corresponding template.

10. Inconsistent In-Text and Reference List Entries

Every in-text citation must have a matching reference list entry, and every reference list entry must be cited in the text. Mismatches are flagged by reviewers and instructors immediately.

APA Citation Tools and Generators

Formatting APA references manually is error-prone. A single journal article reference has 6–8 components that must be in the correct order with correct punctuation. Multiply that by 40 references in a typical paper, and manual formatting becomes a significant time sink.

How to Generate APA Citations Automatically

Modern citation tools can format references from a DOI, URL, or paper title in seconds. The best approach:

  1. Find the DOI — most journal articles published after 2000 have one
  2. Paste the DOI into a citation generator — the tool pulls metadata and formats it
  3. Verify the output — check author names, title capitalization, and date
  4. Copy to your reference list — done

DOI-to-APA Conversion

If you have a DOI, converting it to a properly formatted APA reference is the fastest path to accurate citations. The DOI resolves to the authoritative metadata record for the publication, so the generated citation uses the publisher’s own data rather than a third-party interpretation.

When to Verify AI-Generated Citations

Always spot-check these elements:

  • Author names — middle initials and hyphenated names are frequent error sources
  • Title capitalization — must be sentence case in the reference list
  • Edition and volume numbers — sometimes missing from metadata
  • Page ranges — occasionally incomplete in databases
  • URLs — confirm they resolve to the correct resource

Quick Reference Tables

In-Text Citation Patterns

Scenario Parenthetical Narrative
1 author (Smith, 2023) Smith (2023)
2 authors (Smith & Jones, 2023) Smith and Jones (2023)
3+ authors (Smith et al., 2023) Smith et al. (2023)
Organization (WHO, 2024) WHO (2024)
No author (“Title,” 2023) “Title” (2023)
No date (Smith, n.d.) Smith (n.d.)
Direct quote (Smith, 2023, p. 45) Smith (2023, p. 45)
2 works, same author, same year (Smith, 2023a, 2023b) Smith (2023a, 2023b)

Reference List Templates

Journal article:

Author, A. A., & Author, B. B. (Year). Title of article. Title of Periodical, Volume (Issue), Pages. https://doi.org/xxxxx

Book:

Author, A. A. (Year). Title of book (Edition). Publisher. https://doi.org/xxxxx

Chapter in edited book:

Author, A. A. (Year). Title of chapter. In E. E. Editor (Ed.), Title of book (pp. xx–xx). Publisher. https://doi.org/xxxxx

Webpage:

Author, A. A. (Year, Month Day). Title of page. Site Name. URL

YouTube video:

Author, A. A. [Screen name]. (Year, Month Day). Title of video [Video]. YouTube. URL

Dissertation:

Author, A. A. (Year). Title of dissertation [Doctoral dissertation, University Name]. Database Name. URL

Conference paper:

Author, A. A. (Year, Month Days). Title of paper [Conference paper]. Conference Name, Location.

Annotated Bibliography Format

An annotated bibliography is a reference list where each entry is followed by a brief summary and evaluation. While not part of standard APA papers, many courses require them.

Format

Each entry follows the standard APA reference format, followed by an annotation paragraph (indented, typically 100–200 words):

Example Entry

Walker, M. (2017). Why we sleep: Unlocking the power of sleep and dreams. Scribner.

Walker, a professor of neuroscience at UC Berkeley, presents two decades of sleep research in accessible language. The book synthesizes findings on how sleep affects learning, memory consolidation, emotional regulation, and immune function. Walker argues that chronic sleep deprivation is a public health crisis, linking insufficient sleep to increased risk of cardiovascular disease, Alzheimer’s, and mental health disorders. The book draws on both the author’s own laboratory research and a broad review of the literature. While the writing is engaging and well-sourced, some critics have noted that Walker occasionally overstates causal claims. This source is relevant to my research on cognitive performance in shift workers because it provides a comprehensive framework for understanding sleep’s role in executive function and decision-making.

Annotation Types

  • Descriptive: Summarizes what the source covers
  • Evaluative: Assesses the quality, reliability, and bias of the source
  • Reflective: Explains how the source relates to your specific research question

Most instructors expect a combination of all three elements.

Additional Resources

Official APA Style Resources

Citation Management Tools

Additional Reading

Final Checklist Before Submission

  • [ ] Do all in-text citations match entries in the References list?
  • [ ] Are DOIs formatted as links (https://doi.org/…) where present?
  • [ ] Is the reference list alphabetized and double-spaced with hanging indents?
  • [ ] Did you follow your instructor’s preferences (title page or running head)?
  • [ ] Are all author names formatted correctly (last name, initials)?
  • [ ] Are title capitalizations correct (sentence case for articles, title case for journals)?
  • [ ] Are URLs included where DOIs are not available?
  • [ ] Is the paper double-spaced with 1-inch margins?
  • [ ] Are all headings formatted according to APA levels?

Note: This guide summarizes APA 7th-edition best practices. For definitive answers, consult the APA Style website and the Purdue OWL APA guide.

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