Seven essential yoga books

At The Barnes & Noble Book Blog Monique Alice tagged seven essential yoga books, including:
Bhagavad Gita: The Song of God, translated by Swami Prabhavananda and Christopher Isherwood

If you only ever read one book about yogic philosophy, this should be it. This book is part of the triumvirate of Hindu religious texts, and includes some of the most profound wisdom ever scribed by human hands. “