"...the AMA Manual of Style, since its inaugural version in 1962, and with this 11th edition, is truly the standard, and in the words of one colleague, "the bible of medical publishing." Written by the editorial staff at JAMA and the JAMA Network-including physicians, manuscript editing managers, and current and former managing editors-it is the single most comprehensive text focused solely on medical publishing."
- excerpt from the AMA Manual of Style : A Guide for Authors and Editors, 11th ed.
Zotero is an application that collects, managers, and cites research sources. It works in any OS, connects with your browser, and is free to use.
You can attach PDFs, notes, and images to your citations, organize them into collections for different projects, and create bibliographies.
The Purdue OWL is a great resource for using AMA style.
AMA Style Insider, the official blog of the AMA Manual of Style