Best books to check out for theories in regards to evolution?

This theory or theories has really been irritating my brain. I plan to go the library today and do some research. I suppose I could find most information online but I prefer the library atmosphere and reading books for a change. Just has a nice quality to it sometimes…. :)

Anyways my main question, are there any specific books you could recommend to me or books that would be related enough to be helpful?

Thanks for the help as always.