Player classification. books preferably

i have read through a few books now and would like too improve my player classification skills. one of the earliest books i read when i wasn't as serious player called "winning at poker" had a player classification system taken from a book called "the secret too winning big at tournament poker". i quite liked the idea of this but when looking at reviews for this book it hasnt made me want too commit too the cheapest price i can find the book for... which is around 12 pounds second hand. can anyone suggest any books that discuss this topic in great detail?

Read books, go to training, etc. etc. All this is nonsense. We need the experience of the game. Ability and skill comes with age.