The sites below are great resources for business writing (and writing in general, for that matter). Below the links you will find a list of books that we have in the DSC library about business writing.

Workplace Writers - from Purdue University Libraries
This is a great source.

A Brief Guide to Business Writing: K. Brown and D. Barton, Dept. of Management and Organizations, University of Iowa

Writing Resource Center: Business Writing - Empire State College, State University of New York

The Writing Center, University of North Carolina

Business Writing Center, Michael G. Foster School of Business, University of Washington

The Write Place Catalogue