Computers & Typesetting, Volume B: TeX: The Program

This book is extremely valuable to those hoping to understand and reuse Knuth's classic typesetting algorithms. It contains the every detail needed for the implementation. Each section has a number associated with the source code. Besides, it can also serve as an excellent example of a large project for computer science students. One can understand better "the art of computer programming" after reading this book. Of course, you should get prepared to learn Knuth's Pascal/Web sytle language instead of the popular C/Java language.

This book explains the source code of TeX by it's author. I started to read it and explanations are writing in a comprehensive language. It's a book for people who love TeX with a good experience of TeX.