This online guide from Purdue's OWL website illustrates the basics of ASA style. Use the ASA sub-menu on the left to view general formatting, in-text citations, reference list, etc.
(Formerly the Council of Biology Editors [CBE] Style.) This guide from the Ohio State University Libraries provides citation examples based on Scientific Style and Format: The CSE Manual for Authors, Editors, and Publishers, 7th edition, 2006.
This guide is based on the book by Andrew Harnack and Eugene Kleppinger, entitled Online! A Reference Guide to Using Internet Resources. It includes MLA, APA and Chicago style citation information for electronic resources.
A writing style guide by William Strunk, Jr.