Foundations of Posing by Pierre Stephenson

This is one of the most in depth books on posing I have read. He covers everything from head to toe literally. He discuss posing differences for men and women, for flattering different body types, and an entire section on how to correct for some common issues. He also goes through posing for groups. This was a very complete guide.
Find it here:
Amherst Media
Amazon
Barnes & Noble