Is there a book that tells you the basic information about POW, and not the autobiography of a prisoner.?

like how many camps, people, their conditions, what does oflag, luft, and stalag means and why they are name. Beside that i don't want to search in the internet but books where you can read and understand. Some website tells you alot that really goes with what you are researching for, and thank you for if you help me out here.