Reading a book will give you an introduction to the history and basic principles of the Alexander Technique. A book can also give you an idea of how studying the Technique might help you. For my private students, I recommend reading at least one book on the Alexander Technique in conjunction with their lessons. Here are some of my suggestions:

General Introduction

Brennan, Richard. The Alexander Technique Manual: Take Control of Your Posture and Your Life

Brennan, Richard. Change Your Posture Change Your Life

Gelb, Michael. Body Learning: An Introduction to the Alexander Technique

Jones, Frank Pierce. Freedom to Change: The Development and Science of the Alexander Technique (originally published in 1977 as Body Awareness in Action)

Nicholls, Carolyn. Body, Breath and Being

Vineyard, Missy. How You Stand, How You Move, How You Live

Specific Applications

Balk, Malcolm and Andrew Shields. Master the Art of Working Out

Bergeron-Oliver, Sherry and Bruce Oliver. Working Without Pain: Eliminate Repetitive Strain Injuries with the Alexander Technique

Caplan, Deborah. Back Trouble: A New Approach to Prevention and Recovery