Writing and rhetoric

Joseph M. Williams, Style: Ten Essays in Clarity and Grace, Third ed. (Glenview, Illinois: Scott Foresman, 1989).

Richard R. Lanham, Style: An Anti-Textbook, New Haven, (Connecticut: Yale University Press, 1974).

Usage

H. W. Fowler, A Dictionary of Modern English Usage, 2 ed., (Oxford: Clarendon Press, 1965).

Theodore M. Bernstein, The Careful Writer: A Modern Guide to English Usage, (New York: Atheneum, 1984).

Grammar, punctuation, mechanics, and formats

Kate L. Turabian, A Manual for Writers of Term Papers, Theses, and Dissertations, Fifth ed., (Chicago: University of Chicago Press, 1987).

Diana Hacker, Rules for Writers, 3rd ed., (Boston:  Bedford Books, 1996).

Speaking

Terry C. Smith, Making Successful Presentations: A Self-Teaching Guide, (New York: John Wiley and Sons, 1984)

Myles Martel, The Persuasive Edge: the Executive's Guide to Speaking and Presenting, Revised and expanded edition of the formerly titled 'Before You Say a Word," (New York: Fawcett Columbine, 1989).

Graphical displays

Gene Zelazny, Say It with Charts: The Executive's Guide to Successful Presentations, Second ed., (Homewood, Illinois: Business One Irwin, 1991).

Edward R. Tufte, The Visual Display of Quantitative Information, (Cheshire, CT: The Graphics Press, 1972).