Go to AMA section 3.11 References to Journal Articles.
A complete reference to a journal article includes the following:
■ Authors’ surnames and initials (the names of all authors should be given unless there are more than 6, in which case the names of the first 3 authors are used, followed by “et al”)
■ Title of article and subtitle, if any
■ Abbreviated name of journal (see 13.10, Abbreviations, Names of Journals)
■ Year (or online publication date [month and day, year] if article is published online first and has yet to appear in a paginated issue or is published in an online-only journal)
■ Volume number
■ Issue number
■ Part or supplement number, when pertinent
■ Location (page[s] or e-locator)
■ DOI (if supplied)