Below are some anatomy reference books I have.
Strength Training Anatomy by Frederic Delavier
This is really a bodybuilding book but it's fill with great illustrations of muscles. Recommended if you're into muscles.
Some pictures on my blog | http://www.amazon.com/gp/product/0736063684
Human Anatomy for Artists: The Elements of Form by Eliot Goldfinger
There are photo references put beside the drawn anatomy examples, so it really helps with realistic drawing.
Downside is there's not too much examples of the body as a whole.
Most of the examples are really cut out and explained without relation to the whole body.
Some pictures on my blog | http://www.amazon.com/gp/product/0195052064
Human Anatomy for Artists by Andras Szunyoghy and Gyorgy Feher
This is an anatomy reference book. It has clear and detailed pencil drawings of bones and muscles.
The huge illustrations is a big plus. There are not much text except for labels.
I'm pretty sure anyone can be a master at anatomy after drawing everything in the book.
Some pictures on my blog | http://www.amazon.com/gp/product/084160178X
The Art and Feel of Making it Real: Gesture Drawing for the Animation and Entertainment Industry by Mark McDonnell
Another gesture drawing book if you don't have enough.
Some pictures on my blog | http://www.amazon.com/gp/product/0982231776