Yoga Books
Her are a few books that I think are good! Check them out. They might just be what you are looking for!
This was one of the books I was required to read for my instructors class at Kripalu. I think it is a very good all around introduction to yoga and yogic philosophy. Check it out!
BKS Iyengar is a true legend in the yoga world. His book Light on Life: The Yoga Journey to Wholeness, Inner Peace and Ultimate Freedom is not only the wisdom of a man who has dedicated his life to yoga, but the wisdom of the ages.
A book on the Chakras that I have read a couple of times.
Wheels of Life: A User’s Guide to the Chakra System
It is pretty good! Very clear in the descriptions of the various chakras!