Complete AMA Citation Style Guide

The American Medical Association (AMA) citation style is the standard format for medical and health sciences writing. It’s the preferred citation method for journals, research papers, and academic publications in the medical field. This comprehensive guide covers all aspects of AMA citation formatting.

Overview of AMA Citation Style

AMA citation style uses a numbered system where citations appear as superscript numerals in the text, corresponding to numbered entries in a reference list. This method keeps the text less intrusive while providing complete source documentation.

The key characteristics of AMA style include:

• Numbered citations: Sources are cited with superscript numerals (1, 2, 3)
• Reference list order: References appear in the order they are first cited in the text
• Specific formatting rules: Journal names are abbreviated according to standard lists
• Consistency requirements: All elements must follow precise formatting guidelines
• Medical focus: Designed specifically for health sciences publications

Basic Citation Rules

Journal Articles

The basic format for citing journal articles in AMA style is:

Author(s) initial(s). Last name, Author(s) initial(s). Last name. Title of article. Journal Name. Year;Volume(Issue):pages.

Example: Smith JA, Johnson BC. The role of vitamin D in bone health. J Bone Miner Res. 2023;38(4):512-521.

Books

For complete books, the format is:

Author(s) initial(s). Last name. Book Title. Edition (if not first). Publisher; Year.

Example: Williams RT. Pharmacology and Drug Interactions. 3rd ed. Oxford University Press; 2022.

Edited Books

For chapters in edited books:

Chapter author initials. Last name. Chapter title. In: Editor initials. Last name, ed. Book Title. Edition. Publisher; Year:page range.

Example: Davis K. Immunotherapy advances. In: Brown L, ed. Modern Cancer Treatment. 2nd ed. McGraw-Hill; 2023:145-167.

Websites

Website citations include the URL and access date:

Author/Organization. Title of webpage. Website name. Published month day, year. Accessed month day, year. URL

Example: American Heart Association. Heart disease statistics. American Heart Association website. Updated January 15, 2026. Accessed March 16, 2026. www.heart.org/statistics

In-Text Citation Format

In-text citations use superscript numbers that correspond to the reference list:

“According to recent research,¹ the efficacy of the new treatment has been established.”

Multiple citations appear as: “Studies have shown¹⁻³ significant improvements.”

Non-consecutive citations: “Various sources⁴,⁶,⁸ confirm these findings.”

Citations appear after punctuation marks with some exceptions. In general, place the superscript after periods and commas, but before dashes and semicolons.

Reference List Compilation

The reference list appears at the end of the document with all sources numbered in citation order. Each entry follows specific formatting:

1. Smith JA, Johnson BC. The role of vitamin D in bone health. J Bone Miner Res. 2023;38(4):512-521.

2. Williams RT. Pharmacology and Drug Interactions. 3rd ed. Oxford University Press; 2022.

3. Davis K. Immunotherapy advances. In: Brown L, ed. Modern Cancer Treatment. 2nd ed. McGraw-Hill; 2023:145-167.

Key points for reference lists:

• Number entries sequentially as they appear in the text
• Use hanging indent format
• Abbreviate journal names according to MEDLINE standards
• Include all authors or use “et al.” after the first three authors if there are more than six
• Use standard punctuation throughout

Author Names and Multiple Authors

Author names appear as initials followed by last name. For multiple authors, use the following format:

• Two authors: Author 1 initials. Last name, Author 2 initials. Last name.
• Three to six authors: List all names in the same format with commas between them
• Seven or more authors: List the first three authors followed by “et al.”

Example with multiple authors: Smith JA, Johnson BC, Williams RT, et al. Collaborative research on medical treatments. N Engl J Med. 2023;389(12):1234-1245.

Journal Name Abbreviations

Journal names must be abbreviated according to MEDLINE standards. Common abbreviations include:

• New England Journal of Medicine = N Engl J Med
• Journal of the American Medical Association = JAMA
• The Lancet = Lancet
• American Journal of Cardiology = Am J Cardiol
• Nature Medicine = Nat Med

Always consult the MEDLINE journal title abbreviation list for accuracy.

Dates and Publication Information

Publication dates appear as Year;Volume(Issue):pages for journals:

• Include only the year, not the full date
• For books, include year of publication
• For websites, include publication date and access date
• If no publication date exists, write “Published online” followed by the access date

Special Source Types

Conference Papers

Author(s) initials. Last name. Title of paper. Presented at: Conference Name; Date; Location.

Example: Martinez JL, Garcia SC. New diagnostic approaches in cardiology. Presented at: American Heart Association Annual Conference; March 15, 2026; Los Angeles, California.

Dissertations and Theses

Author initials. Last name. Title of dissertation. [Master’s thesis or PhD dissertation]. University Name; Year.

Example: Thompson RD. Mechanisms of Drug Resistance in Tuberculosis. [PhD dissertation]. Harvard Medical School; 2023.

Government Documents

Author/Agency. Title of document. Publication number. Government Publishing Office; Year.

Example: Centers for Disease Control and Prevention. Guidelines for Infection Control. Publication CDC-2025-1045. U.S. Government Publishing Office; 2025.

Common Citation Mistakes to Avoid

1. Inconsistent abbreviations: Always use standard MEDLINE abbreviations for journal names
2. Incorrect author numbers: Include all authors up to six, then use “et al.”
3. Missing volume or issue numbers: Always provide complete publication information
4. Superscript placement errors: Ensure superscripts follow the correct punctuation rules
5. Improper reference list order: References must appear in citation order, not alphabetically

Digital Object Identifiers (DOI)

When available, include the DOI at the end of the reference. The format is:

Author(s). Title. Journal. Year;Volume(Issue):pages. doi:10.xxxx/xxxxx

Example: Smith JA, Johnson BC. The role of vitamin D in bone health. J Bone Miner Res. 2023;38(4):512-521. doi:10.1002/jbmr.4567

Tools and Resources

Several resources can assist with AMA citation formatting:

• PubMed: Provides formatted citations for journal articles
• Citation managers: EndNote, Zotero, and Mendeley support AMA format
• MEDLINE Journal Title Abbreviation List: Official source for journal abbreviations
• AMA Manual of Style: The complete reference guide for all citation scenarios

Practical Examples

Complete Journal Article Citation

Smith JA, Johnson BC, Williams RT. Effectiveness of combination therapy in hypertension management. J Hypertens. 2023;41(8):1523-1535. doi:10.1097/HJH.0000000000003456

Complete Book Citation

Brown LD. Clinical Pharmacology: Principles and Applications. 5th ed. Elsevier; 2024.

Complete Chapter Citation

Green MC. Drug interactions in elderly patients. In: Williams KP, ed. Geriatric Medicine: A Comprehensive Approach. 2nd ed. McGraw-Hill; 2023:234-256.

Complete Website Citation

National Institutes of Health. COVID-19 Research Information. National Institute of Allergy and Infectious Diseases website. Updated February 28, 2026. Accessed March 16, 2026. www.niaid.nih.gov/covid-19-research

Conclusion

Mastering AMA citation style is essential for anyone writing in the medical and health sciences fields. By following these comprehensive guidelines, you’ll ensure your citations are accurate, complete, and properly formatted. Consistent use of AMA style demonstrates professional writing standards and facilitates proper attribution of sources.

Remember to verify all citation details against original sources, use official abbreviations, and maintain consistency throughout your document. When in doubt, consult the AMA Manual of Style or use citation management software configured for AMA format to ensure accuracy.