AMA (American Medical Association) Manual of Style Found on the SU library list of databases & e-resources.
Citing Medicine, 2nd edition. The NLM (National Library of Medicine) Style Guide for Authors, Editors, and Publishers. Since you will be citing primarily online sources, this section will be especially helpful: Citing Material on the Internet.
Interactive AMA Citation Style guide, developed by the Western New York Library Resources Council.
These online citation managers offer a convenient way to organize and keep track of your references.
EasyBib Free, automatic bibliography and citation maker.