AMA Manual of Style citation and formatting rules for medical journals
AMA Style (11th Edition)
Citation and formatting rules based on the AMA Manual of Style, 11th Edition. Used by JAMA, JAMA Network journals, and many other medical journals.
When to Use
When the target journal specifies AMA citation style
When submitting to JAMA or JAMA Network Open
When the journal instructions reference "AMA Manual of Style"
As the default style for medical manuscripts when no specific style is required
Protocol
1. In-Text Citations
Use superscript Arabic numerals placed after punctuation (periods, commas)
Number references sequentially in the order they first appear in the text
Place citation numbers outside periods and commas, inside colons and semicolons
Multiple citations: use commas with no spaces (e.g., 1,2) or hyphens for ranges (e.g., 1-3)
Do not use citation numbers as nouns (write "Smith et al1 reported" not "Reference 1 reported")
Examples:
Recent studies have demonstrated significant improvement in outcomes.1
Several trials have confirmed this finding.2-4
As reported by Smith et al,5 the intervention was effective.
These results are consistent with prior work1,3,7 in the field.
2. Reference List Format
References are listed numerically at the end of the manuscript in the order cited.
2.1 Author Names
Format: Last name followed by initials (no periods, no spaces between initials)
Multiple authors: separate with commas
Up to 6 authors: list all
7 or more authors: list the first 3, then "et al"
Do not use "and" before the last author
Examples:
Smith JA, Jones BR, Williams CD.
Smith JA, Jones BR, Williams CD, et al.
2.2 Journal Article
Format:
Author(s). Title of article. Abbreviated Journal Name. Year;Volume(Issue):Pages. doi:
Rules:
Article title: sentence case (capitalize only the first word and proper nouns)
Year, volume, issue, and pages follow specific punctuation
Include DOI when available (no period after DOI)
Example -- fewer than 7 authors:
1. Yusuf S, Zhao F, Mehta SR, Chrolavicius S, Tognoni G, Fox KK. Effects of clopidogrel
in addition to aspirin in patients with acute coronary syndromes without ST-segment
elevation. N Engl J Med. 2001;345(7):494-502. doi:10.1056/NEJMoa010746
Example -- 7 or more authors:
2. Mozaffarian D, Benjamin EJ, Go AS, et al. Heart disease and stroke statistics--2015
update: a report from the American Heart Association. Circulation. 2015;131(4):e29-e322.
doi:10.1161/CIR.0000000000000152
Example -- online ahead of print:
3. Smith JA, Jones BR. Novel biomarker for early detection. JAMA Oncol. Published online
March 15, 2024. doi:10.1001/jamaoncol.2024.0123
2.3 Book
Format:
Author(s). Title of Book. Edition [if not first]. Publisher; Year.
Example:
4. Kasper DL, Fauci AS, Hauser SL, Longo DL, Jameson JL, Loscalzo J. Harrison's
Principles of Internal Medicine. 19th ed. McGraw-Hill Education; 2015.
2.4 Book Chapter
Format:
Author(s) of chapter. Title of chapter. In: Editor(s), ed(s). Title of Book. Edition.
Publisher; Year:Pages.
Example:
5. Blendon RJ, Benson JM. Public opinion and health policy. In: Mechanic D, Rogut LB,
Colby DC, Knickman JR, eds. Policy Challenges in Modern Health Care. Rutgers University
Press; 2005:45-54.
2.5 Website / Online Source
Format:
Author(s) or Organization. Title of page. Name of website. Published/Updated date.
Accessed date. URL
Example:
6. World Health Organization. WHO coronavirus (COVID-19) dashboard. World Health
Organization. Accessed January 15, 2024. https://covid19.who.int/
Example -- no author:
7. Diabetes basics. Centers for Disease Control and Prevention. Updated November 3, 2023.
Accessed January 10, 2024. https://www.cdc.gov/diabetes/basics/
2.6 Preprint
Format:
Author(s). Title. Preprint. Posted date. Server Name. doi:
Example:
8. Doe JA, Smith BR. A novel approach to RNA sequencing analysis. Preprint. Posted
June 12, 2024. medRxiv. doi:10.1101/2024.06.12.24308841
2.7 Government / Agency Report
Format:
Organization. Title of Report. Publication number (if applicable). Publisher; Year.
Example:
9. Agency for Healthcare Research and Quality. National Healthcare Quality and Disparities
Report. AHRQ Publication No. 23-0054. US Department of Health and Human Services; 2023.
3. Journal Name Abbreviations
Use the NLM (National Library of Medicine) catalog for official abbreviations
International Committee of Medical Journal Editors. Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly Work in Medical Journals. Updated 2023. http://www.icmje.org/recommendations/