The Stage Management Handbook by Daniel A. Ionazzi ISBN 1-55870-235-0
This is my favorite, go-to resource for forms, ideas, information and explanations. It covers every part of the SM process from pre-production through performance as well as a section dealing with politics and the managing of people. There is also a great section in the back of sample forms. There are side notes with definitions, sample prompt book pages, diagrams, etc.
I cannot recommend this book highly enough. Go get a copy. You’ll thank me later.
The Awesome Stage Manager