julian sprung (he's got great advice and been in the hobby forever), same with bob fenner,,,,also make sure that anything you buy is not more than 5-7 years old,, technology jumps in this hobby..
Fenners book is great.
I like The Nano Reef Book by Chris Brightwell
A PocketExpert Guide to Marine Fishes: 500+ Essential-To-Know Aquarium Species by Scott W. Michael
A PocketExpert Guide to Marine Invertebrates: 500+ Essential-to-Know Aquarium Species by Ronald L. Shimek
Aquarium Corals : Selection, Husbandry, and Natural History by Eric H. Borneman