Naked Chokes and Groin Punches - A Mixed Martial Arts Handbook
This is an advanced textbook of the kind handed out to third year university students, and is clearly aimed at people who are thinking that getting in the ring will make them into hard men. It has many diagrams and densely packed passages of text. You'd need to have quite a lot of subject knowledge in order to be able to decode the complex arguments within.
This is a studyable object
Dunglen University Library