APA 7th edition is the standard format for research papers in social sciences, psychology, nursing, education, and many other disciplines. APA formatting covers everything from margins and font to in-text citations and reference list organization. Many students understand their research content but lose points on formatting because APA rules are detailed and easy to get wrong. This comprehensive guide covers APA 7th requirements, common mistakes, and how to format a research paper correctly from start to finish.
APA 7th edition overview
APA (American Psychological Association) format specifies how academic papers should be structured and formatted. Key elements:
- Page setup: 1-inch margins all sides, 12-point font (Times New Roman, Calibri, or similar), double-spaced
- In-text citations: (Author, Year, page#) format embedded in the text
- Reference list: Alphabetical list of all sources at the end, with hanging indents
- Headings: Five levels of headings with specific capitalization and formatting
- Title page: Specific format with running head, title, author, affiliation, date
- Abstract (if required): 150-250 words, single paragraph, on its own page
APA 7th edition (current) differs from APA 6th edition in several ways, so make sure your professor specifies which version they want.
Page setup and formatting
Margins and spacing
- Margins: 1 inch on all sides (top, bottom, left, right)
- Line spacing: Double-spaced throughout (including title page, headings, reference list)
- Font: 12-point Times New Roman (or Calibri, Arial, Courier New — check with your professor)
- Paragraph indentation: First line of each paragraph indented 0.5 inches
- Alignment: Left-aligned (not justified), creating a ragged right margin
Header and page numbers
- Running head: Short version of title (max 50 characters) in all caps in the header, left-aligned
- Page numbers: Right-aligned in header, starting from title page (though some universities request title page not to show the number)
In-text citations: APA format
In-text citations tell the reader where information comes from. APA uses author-date format:
Basic format
- One author: (Smith, 2022) or "Smith (2022) found that..."
- Two authors: (Smith & Johnson, 2022)
- Three or more authors: (Smith et al., 2022) — use "et al." after first author
- No author: Use organization name or shortened title: (American Psychological Association, 2022)
- Direct quote: (Smith, 2022, p. 45) — page number required for quotes
Placement rules
- At end of sentence: The citation goes before the period. "Research shows this is effective (Smith, 2022)."
- Within sentence: "Smith (2022) argues that effectiveness varies by context."
- For paraphrasing: Cite even when you don't quote directly. Not citing paraphrased ideas is plagiarism.
Reference list: APA format
The reference list (not "bibliography") appears on a new page at the end of your paper. It includes all sources cited in the text.
Basic format (journal article example)
Author(s). (Year). Title of article. Title of Journal, Volume(Issue), page range. https://doi.org/xx.xxxx
Example: Smith, J., & Johnson, K. (2022). Effects of flipped classrooms on student engagement. Journal of Educational Research, 115(2), 234-251. https://doi.org/10.1234/jer.2022.12345
Organization rules
- Alphabetical order: By first author's last name
- Hanging indent: First line flush left, subsequent lines indented 0.5 inches
- Title case for books: Capitalize first word, first word after colon, proper nouns. Lowercase the rest.
- Sentence case for articles: Capitalize only first word, proper nouns, and first word after colon. Everything else lowercase.
- DOI preferred: Use https://doi.org/## format when available
- No "pp.": APA doesn't use "pp." before page numbers (just: p. ## or pages: ##-##)
Common source types in APA format
| Source type | Format |
|---|---|
| Journal article | Author(s). (Year). Title. Journal, Volume(Issue), pages. DOI |
| Book | Author(s). (Year). Book title. Publisher. DOI |
| Chapter in edited book | Author(s). (Year). Chapter title. In Editor(s) (Eds.), Book title (pages). Publisher. |
| Website | Author/Organization. (Year). Page title. Retrieved from https://url.com |
| Newspaper article | Author. (Year, Month, Day). Title. Newspaper Name, Section, pages or URL |
Headings in APA format
APA uses up to five levels of headings. Most research papers use 2-3 levels:
- Level 1 (Centered, Bold, Title Case): Main section heading
- Level 2 (Left-aligned, Bold, Title Case): Subsection heading
- Level 3 (Indented, Bold, lowercase, ending with period): Sub-subsection heading continues text on same line.
Common APA formatting errors
- Inconsistent capitalization in references: Title case for books, sentence case for articles. Many students capitalize everything.
- Missing page numbers on direct quotes: APA requires (Author, Year, p. #) for quotes. (Author, Year) alone is incomplete.
- Hanging indent not applied: The second and subsequent lines of each reference must be indented. Many papers have flush-left references (wrong).
- Wrong heading levels: Students often use centered bold for everything instead of using the five-level hierarchy.
- Missing in-text citations: Paraphrased ideas need citations even without quotation marks. This is the most common plagiarism mistake.
- Improper punctuation: "(Smith, 2022, p. 45)." is wrong — the period goes inside the parentheses when the citation ends the sentence.
- DOI formatting: Use https://doi.org/xx.xxxx format, not "DOI: xx.xxxx"
APA 6th vs. 7th edition: Key changes
If your professor says "APA 7th," make sure you use 7th edition rules:
- DOI format: 7th uses https://doi.org/; 6th used "doi:"
- Up to 20 authors: 7th lists all; 6th used "et al." after 7 authors
- URL formatting: 7th doesn't require "Retrieved from" for most websites
- In-text citations: Generally the same, but punctuation rules refined slightly
Quick APA formatting checklist
- ☐ 1-inch margins all sides
- ☐ Double-spaced throughout
- ☐ 12-point Times New Roman or similar
- ☐ Running head and page numbers in header
- ☐ Title page with correct format
- ☐ In-text citations: (Author, Year) format
- ☐ Page number on quotes: (Author, Year, p. #)
- ☐ Reference list alphabetized
- ☐ Hanging indents on reference list
- ☐ Every in-text citation has a reference list entry
- ☐ Every reference list entry is cited in text
Get APA formatting help
Whether you need citation correction, reference list formatting, or a full APA format review, we help ensure your paper meets APA 7th standards.
Order APA helpFAQ
Use APA 7th (current edition, published 2020). Unless your professor specifies 6th edition, assume they want the latest. If unsure, ask.
Check with your professor. Some require it; some say just start with "Level 1 Heading" on page 1 with your name/date in the header. APA allows both formats — know your professor's preference.
Depends on your assignment and paper length. A general rule: 1.5-2 references per page. A 10-page paper might have 15-20 references. Check your assignment for a specific requirement.