Style Manuals (for citing paper sources)
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Sites for specific styles are first:

APAStyle.org
From the American Psychological Association, “The following is excerpted from the new 5th edition of the Publication Manual.”

MLA Style
"These guidelines on MLA documentation style are the only ones available on the Internet that are authorized by the Modern Language Association of America. "

Documentation: Chicago Style
Chicago Manual of Style Citation Guide
The Chicago Style for citation, both sites include electronic formats (scroll down).

Columbia University Press Columbia Guide to Online Style (CGOS)

Citing Electronic Information in History Papers
These recommendations are based upon a number of styles.

Brief Citation Guide...History and the Humanities
"...suggestions for citations of Internet sources in history and the humanities are derived from the essential principles of academic citation in Kate L. Turabian, A Manual for Writers of Term Papers, Theses, and Dissertations, 5th ed."

These links lead to lists of sites:

IPL Citing Electronic Resources

Citation Guides for Electronic Documents