questions about books
 

I am looking for a book, or a couple of books; one that would highlight aqquarium fish, and their traits, their needs, reef compatibility etc. Another book for the basics of reef keeping. I have been in the hobby for just over three years but feel that I would benefit from some more in depth research outlining the essentials. Any suggestions are welcome.
Books 1. Reef keeping essentials? 2. Aquarium fish? also any fish sites that have proved helpful to yourself.
Thanks