by Ann
Raimes
How 10
(Handbook for Office Workers)
by Lyn R.
Clark, James Leland How 9 Clark, Mary Ellen Guffey
http://www.bartleby.com/64/index.html
by William
Strunk
http://www.bartleby.com/141/index.html
http://www.m-w.com/dictionary.htm
by Paul
Brians
http://www.wsu.edu/~brians/errors/
by Diana
Hacker
http://www.bedfordstmartins.com/hacker/writersref/
http://www.better-english.com/grammar.htm