Recommended reading for beginners:
Body Learning by Michael Gelb
The Use of the Self by F.M. Alexander
How You Stand, How You Move , How You Live by Missy Vineyard

F.M. Alexander’s four books
Man’s Supreme Inheritance
Constructive Conscious Control of the Individual
The Use of the Self
The Universal Constant in Living

Other Great books
Zen in the Art of Archery by Eugen Herrigel
The Alexander Technique As I See It by Patrick Macdonald
Back Trouble by Deborah Caplan

Websites
amsatonline.org
stat.org.uk
alexandertechnique.com
markjosefsberg.com