Provides guidelines for American English writing style, grammar, punctuation, and citation. Users can choose either the 17th or 18th edition. The online version also includes tools (such as sample correspondence and proofreaders' marks), searchable Q&A entries, and a Quick Guide to citation.
The Chicago Manual of Style (Print) by 
A Manual for Writers of Research Papers, Theses, and Dissertations by What's the difference?
"Turabian is a kind of citation involving either footnotes or endnotes. For the most part, it is a condensed version of the Chicago stylebook written especially for student writers." Hollins University Writing Center
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