APA Style and CSE Style are the principal formats used in biology. Writing Papers in the Biological Sciences is useful for formatting papers beyond citation needs. Copies of each are available in paper format at the Reference Desk.
Publication Manual of the American Psychological Association, 7th ed. by 
Scientific Style and Format by 
Writing Papers in the Biological Sciences by Use Endnote Web for citation management . The system works particularly well for the sciences. Create a free, basic account first. Then login to Endnote before you begin a database search. Exporting citation information works fairly smoothly using the export feature of an individual database. Once exported, citations can be arranged in folders of the user's choice and creation.
See the Gustavus Library Guide, Cite Your Sources for additional formatting help.
