The role of the First Assistant Camera (1st Assistant Camera, 1st AC - and previously know as the Focus Puller) is one of the most skilled jobs on a film crew.
You can refer book for Assistant Camera man .
Book Name-The Camera Assistant's Manual
Author Name-by David E. Elkins SOC
Link : http://www.amazon.in/Camera-Assistants-Manual-David-Elkins/dp/0240805585