Style Manuals - Examples of how to use them:

• APA Manuals (American Psychological Association) - A guide from Purdue University
• The Chicago Manual of Style Online Quick Guide
• MLA Style Manual (Modern Language Association)
• Turabian Bibliographic Form: Footnote/Endnote Style
• Turabian Bibliographic Form: Parenthetical Reference

Citations for electronic resources:

• The Columbia Guide to Online Style 2nd Edition
• Library of Congress - How to Cite Electronic Resources

Other citation resources:

• Citing Sources - Duke University
• How to Cite (grouped by source type) - Dartmouth College