There are a ton of yoga books out there. Based on the specifics of your request, the two books I highly recommend are Journey Into Power by Baron Baptiste and Light On Yoga by B.K.S. Iyengar. Both can be found on www.amazon.com.
Journey Into Power provides a solid foundation for a power yoga practice. It addresses the physical and spiritual components of yoga as well as addresses meditation, diet and other key principles to discovering your yoga practice. Both English/Sanskrit names for poses are provided as well as alignment tips and modifications. This book really makes yoga accessible, challenging and fun.
Light On Yoga, known as the bible of yoga, provides an overview of yoga, asana descriptions, philosophy and breathing techniques. Since it was written back in the 60’s/70’s, the pictures are black & white and it’s a tad hard to follow but it’s definitely a good book to have on hand.