Recommended Yoga books?

I wanted to add yoga into my BJJ. I don't have any cash to go to a gym though. I have some familiarity with yoga from studying Tai Chi and meeting people involved. I am more interested in Kundalini yoga, but open to anything. Can anyone recommend some reading?

Yoga for Regular Guys by DDP

Nowaydo, thank you VERY much. I actually bought light on yoga last night, and I really like it. I am checking out that website and it seems really good too. I'm going to check out those other titles, and definitely go buy Kundalini yoga right now. Thanks!