The AMA Manual of Style Online (10th ed.) contains information that medical and scientific researchers, writers, and editors need to produce well-organized, clear, readable, and authoritative manuscripts. This is a collaborative resource between Oxford University Press, JAMA, and the Archives Journals.
General rules from the 10th edition:
Items are listed numerically in the order they are cited in the text
Include up to 6 authors
For more than six, provide the names of the first three authors and then add et al
If there is no author, start with the title
Periodicals (journals, magazines, and newspapers) should have abbreviated titles; to check for the proper abbreviation, search for the Journal Title through LocatorPlus at the National Library of Medicine website