APA Citation Format: Every Rule You Need With Examples for Every Source Type (2026)

Mastering APA citation format is one of those academic skills that pays compound dividends — every paper, every seminar, every thesis becomes easier once you genuinely understand the system. But most guides either bury you in rules without context or gloss over the edge cases that actually trip students up: how do you cite a Twitter thread? A government dataset? An AI-generated image? A podcast episode?

This guide covers APA 7th edition — the current standard — comprehensively and practically, with a real example for every source type. It follows the authoritative rules from the APA Style website and Purdue OWL, two of the most referenced citation authorities in academia.

Understanding the APA Citation System

APA (American Psychological Association) format is based on an author-date citation system. Every in-text citation matches a full entry in the reference list at the end of your document. The relationship is one-to-one: every source you cite in-text must appear in the reference list; every reference list entry must be cited somewhere in the text.

The reference list serves four purposes:

• Allows readers to locate and verify your sources
• Credits the original authors of ideas and data you used
• Demonstrates the depth and quality of your research
• Allows your work to be reproduced or extended by other researchers

APA is used predominantly in psychology, social sciences, education, nursing, and many health sciences disciplines. If you’re unsure whether your field uses APA, check your course style guide or ask your supervisor. For Harvard referencing — the other widely used author-date system — see our Harvard referencing guide.

In-Text Citation Rules: Every Scenario

Basic Format

APA in-text citations include the author’s last name and the year of publication. For direct quotes, add the page number:

• Paraphrase: (Smith, 2023)
• Direct quote: (Smith, 2023, p. 45)
• Narrative citation: Smith (2023) argued that…

Multiple Authors

• One author: (Smith, 2023)
• Two authors: (Smith & Jones, 2023) — always use “&” inside parentheses; “and” in narrative
• Three or more authors: (Smith et al., 2023) — et al. from first citation
• Same author, same year: (Smith, 2023a) and (Smith, 2023b)

No Author

Use the first few words of the title in italics for works with no author: (Student Handbook, 2023)

No Date

Use “n.d.” (no date): (Smith, n.d.)

Multiple Citations in One Parenthesis

Order alphabetically by first author’s surname, separated by semicolons: (Brown, 2021; Smith, 2023; Williams, 2022)

Reference List: Formatting and Structure

The reference list follows these structural rules:

• Starts on a new page with the heading “References” (bold, centred)
• Double-spaced throughout (no extra lines between entries)
• Hanging indent: first line flush left, subsequent lines indented 0.5 inches
• Alphabetical order by first author’s last name
• All author last names first (Smith, A. B., not A. B. Smith)
• Use sentence case for article and chapter titles
• Use title case for journal names and book titles (italicised)
• Include DOI for all journal articles that have one (format: https://doi.org/xxxxx)

APA Citations by Source Type (With Examples)

Journal Article

Format: Author, A. A., & Author, B. B. (Year). Title of article. Journal Name, Volume(Issue), pages. DOI

Example:
Nguyen, T. L., & Patel, R. S. (2024). The effect of AI-assisted writing on essay quality in undergraduate students. Journal of Educational Technology, 41(3), 112–128. https://doi.org/10.1037/edu0000567

Book (Single Author)

Format: Author, A. A. (Year). Title of book: Subtitle in sentence case. Publisher.

Example:
Creswell, J. W. (2023). Research design: Qualitative, quantitative, and mixed methods approaches (6th ed.). SAGE.

Book Chapter (Edited Volume)

Format: Author, A. A. (Year). Title of chapter. In E. Editor & F. Editor (Eds.), Title of book (pp. xx–xx). Publisher. DOI

Example:
Morrison, K. (2024). Epistemological frameworks in qualitative research. In R. Denzin & Y. Lincoln (Eds.), Handbook of qualitative research (6th ed., pp. 78–102). SAGE.

Website

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

Example:
World Health Organization. (2025, January 15). Global student mental health report 2025. https://www.who.int/reports/student-mental-health-2025

Government Report

Format: Author, A. A. (Year). Title of report (Report No. xxx). Publishing Agency. DOI or URL

Example:
National Institute for Health Research. (2024). AI in higher education: Evidence review (Report No. NIHR-2024-022). NIHR. https://www.nihr.ac.uk/reports/ai-education-2024

Dissertation or Thesis

Format: Author, A. A. (Year). Title of dissertation [Doctoral dissertation/Master’s thesis, University Name]. Database. URL

Example:
Adebayo, F. C. (2024). Machine learning approaches to early detection of academic underperformance [Doctoral dissertation, University of Manchester]. ProQuest. https://proquest.com/dissertation/12345

Podcast Episode

Format: Host, A. A. (Host). (Year, Month Day). Title of episode (No. xx) [Audio podcast episode]. In Podcast Name. Production Company. URL

Example:
Rao, P. (Host). (2025, March 10). How AI is changing the PhD experience (No. 87) [Audio podcast episode]. In Research Unlocked. Spotify Podcasts. https://open.spotify.com/episode/abc123

Social Media Post (Twitter/X)

Format: Author, A. A. [@username]. (Year, Month Day). First 20 words of post [Type of post]. Platform. URL

Example:
Miyamoto, K. [@dr_miyamoto_phd]. (2025, February 3). New preprint out: AI hallucination rates in academic writing tasks — our key findings [Tweet]. Twitter/X. https://x.com/dr_miyamoto_phd/status/123456789

YouTube Video

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

Example:
APA Style. [APA Style]. (2024, September 12). How to cite AI-generated content in APA 7th edition [Video]. YouTube. https://www.youtube.com/watch?v=example

AI-Generated Content (New in 7th Edition Update)

For content generated by AI tools (ChatGPT, Claude, etc.), APA guidance as of 2024 recommends treating AI as the author with the tool name, the version, and a description of the prompt. This is a contested and evolving area — check your institution’s current AI citation policy.

Format: OpenAI. (Year). ChatGPT (Version) [Large language model]. URL

Example:
OpenAI. (2025). ChatGPT (GPT-4o) [Large language model]. https://chat.openai.com

What Changed in APA 7th Edition

If you’ve used APA 6th edition before, the 7th edition introduced significant changes:

12 Common APA Citation Mistakes and How to Fix Them

1. Title case in article titles: Article and chapter titles use sentence case (only first word and proper nouns). “The Impact of Social Media on Student Wellbeing” should be “The impact of social media on student wellbeing.”
2. Old DOI format: Still writing “doi: 10.1037/…” should be “https://doi.org/10.1037/…”
3. Including publisher location: APA 7th removed this requirement. “New York, NY: Wiley” should be just “Wiley.”
4. Not italicising journal names: The journal name and volume number are italicised. Issue number is not.
5. Et al. threshold: In APA 7th, use et al. for 3+ authors from the very first citation.
6. Missing ampersand: Inside parentheses, use “&”: (Smith & Jones, 2023). In narrative: “Smith and Jones (2023) found…”
7. Alphabetical order: Reference list must be in strict alphabetical order by first author’s surname, then first initial for same-surname authors.
8. No hanging indent: Every reference entry needs a hanging indent (first line flush, rest indented).
9. Website “Retrieved from”: No longer required in APA 7th unless the content changes over time.
10. Citing the textbook, not the primary source: Always try to cite the original study, not the textbook that mentioned it. Use “as cited in” only when the primary source is unavailable.
11. Wrong edition rules: Still using APA 6th formatting (especially for authors and DOIs) is one of the most common errors in 2026.
12. Missing “eds.” notation: Edited books need “(Ed.)” or “(Eds.)” after editor names in the reference list.

APA Citation Tools: Which to Trust in 2026

Several tools can help automate APA formatting, but they vary significantly in accuracy:

• Tesify (recommended): APA 7th edition specifically calibrated, integrated within the dissertation writing workflow, zero hallucination. See our automatic bibliography generator guide for full details.
• Zotero: Free and highly accurate; requires manual source entry for non-database sources.
• Purdue OWL: Not a tool but the most authoritative free APA reference guide — use it to verify edge cases.
• Citation Machine / EasyBib: Convenient but known for style version errors; always verify output against official guide.
• ChatGPT: Frequently halluculates citation details and applies incorrect rules — not recommended for citation generation.

For cross-language comparison of APA rules, see the guides at Tesify ES (Spanish APA guide) and Tesify PT (Portuguese APA guide).

Frequently Asked Questions