The Penguin Guide to Punctuation (Penguin Reference Books)
Making a Point: The Pernickety Story of English Punctuation
Ground Rules for Writers: A QUICK AND EASY REFERENCE GUIDE FOR ALL THE PAINFUL PUNCTUATION, GHASTLY GRAMMAR, AND PESKY SOUND ALIKE WORDS, FRACKING UP YOUR ... (Your Easy Writing Reference Series Book 1)
Grammar for Grown-ups: Everything you need to know but never learnt in school