The Business Writer's Handbook . St. Martin's Press, 1997.
Any edition is ok.
Harty, Kevin J. Strategies for Business and Technical Writing, 4th Edition. Allyn and Bacon, 1999. We will do a lot of writing, learn to be better critics of other people's writing, and learn to plan, research, and write with efficiency and effectiveness. We will pay particular attention to writing with a clear purpose for particular audiences. You will prepare two presentations for the class.