AMA style is used in medical, biomedical, and some other health-science writing. It uses numerical citations linked to a numbered reference list. The precise rules depend on the source type and the edition required by a course or publication, so students should confirm that their assignment expects the 11th edition before formatting a paper.
The basic AMA citation system
AMA generally uses superscript Arabic numerals in the text. Sources are numbered consecutively in the order they first appear, and the reference list follows that order. When the same source is cited again, the original number is reused.
Superscript placement and punctuation matter. Follow the applicable AMA instructions for whether a number appears outside a period or comma and how to format a group of citations. Do not copy the punctuation from APA or MLA examples.
Illustrative in-text pattern: The finding has been reported previously.¹
References
1. Author AA. Title of article. Journal Name. 2024;10(2):100-108.- This journal reference is a format illustration, not a real publication.
- Use the number in the text to connect a claim to the matching reference.
- Number references in order of first citation, not alphabetically.
What belongs in an AMA reference
The fields depend on the material. A journal article reference commonly includes author names, article title, journal title, year, volume, issue, page range or article number, and DOI when available and relevant. Books, websites, reports, and online-first articles use their own formats.
For medical journal titles, AMA uses journal abbreviations according to its guidance. Check the appropriate authoritative journal index or reference source rather than making up an abbreviation. Confirm whether your course requires an accessed date or URL for a particular online source.
- Transcribe the author list accurately.
- Use the exact article title and the correct journal title or abbreviation.
- Check year, volume, issue, page range, and DOI against the publisher record.
- Follow the required pattern for online sources and dates.
How to handle repeated sources
Once you cite a source as number 1, it remains number 1 each time that source appears again. A reference-management tool can help keep numbering consistent, but review the final sequence if you move paragraphs, add new sources, or delete citations.
Citations should be placed close enough to the claims they support for readers to understand which evidence is being attributed. A reference list by itself does not show which statement came from which source.
AMA style is not a substitute for clinical evidence checking
Formatting a citation correctly does not prove that the source is accurate, current, or appropriate for a medical claim. Evaluate study design, population, limitations, publication date, and whether a guideline or systematic review is more suitable for the question.
For patient-care decisions or technical claims, follow your instructor’s directions and use authoritative databases and clinical sources. This guide explains referencing mechanics; it is not medical advice.
Common AMA citation mistakes
A few careful checks prevent errors that can make medical and scientific sources difficult to verify.
- Mixing author-date citations with the AMA numbered system.
- Re-numbering a source each time it is cited.
- Alphabetizing references instead of using citation order.
- Using an incorrect or unverified journal abbreviation.
- Copying a citation from a database without checking the final publication details.
- Ignoring the course’s specified edition or local formatting instructions.
Official and university resources
The AMA Manual of Style’s guide to citing is available at https://academic.oup.com/amamanualofstyle/pages/about/guide-to-citing. Purdue OWL also provides an introduction to AMA style at https://owl.purdue.edu/owl/research_and_citation/ama_style/. These resources can help you verify the exact format for the sources in your paper.
Final AMA checklist
Use the style required by your health-science program or instructor, and verify the source record before submission.
- In-text citations use the prescribed numerical format.
- The first citation to each source determines its number.
- Repeated use of a source reuses that number.
- References are listed in citation order.
- Publication details are accurate and consistent with AMA 11 or the required edition.
Understanding the concept is the first step.
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