Overcoming Gravity

No better book on the nitty gritty of calisthenics. 

There isn't really anything else to say about this book. It's the definitive (and weighty) tombe on calisthenics and bodyweight programming. If you have started something like the Reddit /r/bodyweightfitness recommended routine and are wondering why things are programmed the way they are, then this book is a great explanation of everything.