Sublime
An inspiration engine for ideas
Bryan A. Garner’s Garner’s Modern English Usage, also known to many in the editing world as the bible
Emmy J. Favilla • A World Without "Whom"
The Redbook: A Manual on Legal Style, 3d: A Manual on Legal Style (American Casebook Series)
amazon.com
Bill Walsh (who I’ve described exclusively as my personal hero since first picking up a copy of his essential text The Elephants of Style: A Trunkload of Tips on the Big Issues and Gray Areas of Contemporary American English