International Committee of Medical Journal Editors
Only available online. You may download a pdf version for your use.
Sample references using ICMJE, compiled and maintained by the U.S. National Library of Medicine.
ICMJE "Preparing a Manuscript"
Journals following ICMJE
You can find journal abbreviations here, or by searching the journal name in MEDLINE. You'll need the abbreviation for citing journals using ICMJE.