A copy editor learns that she can never trust a writer to get a quotation right. Rely on Bartlett's. The CD-ROM version is really fun to use. The Chicago Manual of Style 14th ed. University of Chicago Press, 1993.
New editions come out infrequently.
You'll need a book like this to guide you on typesetting style and the more complex aspects of formatting print, e.g. footnotes, bibliographies, mathematical equations, extracts, and citations. Random House, 1999. Scout around in your local used-book stores. Packed with useful information. Oxford University Press, 1987.