The Oasis Guide To Asperger Syndrome by Barbara L. Kirby, Patricia Romanowski Bashe (2005, Hardcover, Revised)

This is the book that I recommend the most to anyone who wants to learn about Asperger's Syndrome and what steps they need to take to help someone they know with AS. It's easy to read and understand and very helpful. Especially when the whole concept is new to you, this is the book to read.