The Penguin Dictionary for Writers and Editors by Bill Bryson
Written English is full of pitfalls and confusions, even for native speakers and writers of the language. Covering spelling, capitalization, plurals, hyphens, abbreviations, foreign names and phrases and British and American usages, this book provides a guide through the controversies and disputes. The editor's books include "The Penguin Dictionary of Troublesome Words", "The Mother Tongue", "The English Language" and "The Lost Continent: Travels in Small-Town America".