Writing

The Elements of Style by Strunk and White

On Writing: A Memoir of the Craft by Stephen King

Grammar and Punctuation

A Student's Introduction to English Grammar by Huddleston and Pullum

The Ins and Outs of Prepositions by Jean Yates

English Grammar in Use with answers and CD-ROM by Raymond Murphy

Eats, Shoots & Leaves by Lynne Truss

Vocabulary

Word Power Made Easy by Norman Lewis

Logic Model

Logic Modeling Methods in Program Evaluation by Joy Frechtling

Editing and Proofreading

The Copyeditor's Handbook: A Guide for Book Publishing and Corporate Communication (3rd Edition) by Amy Einsohn

Document Design

Dynamics in Document Design by Karen Schriver

Document Design: A Guide for Technical Communicators by Miles Kimball and Ann Hawkins