Build APIs You Won’t Hate. P. Sturgeon

 This book will discuss the theory of designing and building APIs in any language or framework. This theory will be applied in examples built mostly in PHP, with some Ruby and Python too. The book will not be too code-heavy regardless, since reading code is no fun.
 By the end of this book, you will have built an API that can create, read, update, delete things, handle searching, and do everything else a good Hypermedia API needs to do.