Originally written in 1968 and reprinted in 1997, The Triple Post Offense (Sideline Triangle) by Tex Winter contains everything you need to know to run the offense that made the Chicago Bulls six-time NBA Champions.
This book is divided into the following three parts:
Part I diagrams and discusses the drills necessary to develop the offense and the offense itself with all of its options.
Part II is a developmental program that will help teach players the skills needed to run the offense.
Part III discusses the coaching profession, including the psychology of coaching, practice organization, and preparing for the job.
This book is technical and in-depth, but if you are looking for information on the triangle offense made famous by Tex Winter, this is the go-to resource.