Best Yoga Books

[Siim Land]

I want to increase my knowledge about Yoga as a discipline not as a workout program.
What are the best fundamental Yoga books out there? The ones that focus on the philosophy and history aspect of it.
Also, I'm interested in warrior type Yoga. Something that they would have taught ancient warriors like Arjuna.
What are your best recommendations?

[Toby]

http://cwsv.belurmath.org/complete_works.htm