Elements of Style
by William Strunkand and E. B. White.
It should be the "... daily companion of anyone who writes for a living
and, for that matter, anyone who writes at all" (Greensboro Daily New).
"No book in shorter space, with fewer words, will help any writer more than
this persistent little volume" (The Boston Globe).
The Gregg Reference Manual/Indexed With Flap
by William A. Sabin.
Provides up-to-date guidance on grammar, usage, style and format for
a variety of business documents. Includes solutions to e-mail problems
and the basic rules for formal reports.
The Chicago Manual of Style: The Essential Guide for Writers, Editors, and Publishers
by University of Chicago.
This weighty tome is the essential reference for all who work with
words -- writers, editors, proofreaders, indexers, copywriters, designers,
publishers, and students. Discover who Ibid is, how to deftly avoid the
split infinitive, and how to format your manuscripts to impress any
professor or editor.