Merriam-Webster’s Collegiate Dictionary, 11th edition

Garner's Modern Am Usage

Garner’s Modern American Usage by Bryan A. Garner, 3rd edition

The Best Punctuation Book, Period by June Casagrande

McGraw-Hill Grammar and Usage

McGraw-Hill Handbook of English Grammar and Usage, 2nd edition

Oxford guide to writing

Oxford Essential Guide to Writing by Thomas S. Kane

Grammar Girl quick and dirty tips

Grammar Girl’s Quick and Dirty Tips for Better Writing by Mignon Fogarty