Reading about Writing
Lamott, Anne. Bird by Bird: Some Instructions on Writing and Life. Anchor. 1995. A delightful, highly readable book on writing. You will feel encouraged, amused, and inspired to get going.
Patricia T. O'Conner. Words Fail Me: What Everyone Who Writes Should Know About Writing. Harcourt Brace, 1999. Good advice about writing is rarely fun to read. You may also want to read her book on grammar: Woe Is I : The Grammarphobe's Guide to Better English in Plain English.
Purdue University’s Online Writing Lab..
http://owl.english.purdue.edu/ A huge collection of handouts that you may use freely, provided that you credit the source.
Williams, Joseph. Style: Ten Lessons in Clarity and Grace. Addison-Wesley. 6th edition, 1999.
Tough but wonderful. A worthwhile addition to your personal library, but be prepared to work hard on the exercises. The ideas on flow and cohesion are excellent.
William Knowlton Zinsser. On Writing Well: The Classic Guide to Writing Nonfiction 6th edition (April 1998). Harper. A fine book. His preferences are writing that is clear, simple, brief, and has humanity.