Shoot Pool, not people
Jimmy Caras' "Trick and Fancy Shots" belongs on every list imo. Probably tbe best book on trick shots ever published. Good illustrations and equally good explanations how to shoot each shot.As for instructional books, here's my list,
Robert Byrne -- four books: Standard, Advanced, Wonderful World, Trick Shots
Straight Pool: Capelle, Cranfield and Moy, Mosconi
General: Martin, Alciatore, Wilson, Fels
Oldies (which are under $10 now): Cottingham, Knuchell, Lassiter, Crane, Mosconi red book, Hoppe (1942), Joe Davis
The Rules -- pick your own set. Few of your opponents will have read any set.
I don't much care for the psychology books. but I have found The Inner Game of Tennis and The Pleasures of Small Motions useful in my own game. And that is the test for such books: do they make a difference in the way you play? I think most fail. I don't think any of the general pool books that venture into that area succeed.
The first group -- instructional -- also need to pass tests. Is what the author says on a particular point true? Is it useful? Can you use it in your current game? Will you be able to use it later? And for advanced students: What are the limitations and extensions of what the author says?