For the first time, the editors of the acclaimed American Heritage(R) Dictionary have applied their efforts to word usage as its own subject. The result is this

Fully revised and updated, and now available online and in print.

If you need a quick and effective guide to correct English, then Oxford A-Z of English Usage is just what you are looking for, containing a gold mine of useful

This book analyzes the errors most commonly made in spoken and written English and presents them in a systematic, down-to-earth manner. It does not dictate gram

Online version of Common Errors in English Usage written by Paul Brians.