If getting organized were as easy as reading a book, then I wouldn't find organizing books in nearly every client's home! That said, here are some excellent books that can help give you insight into your organizing dilemma and motivation to help you change.
If you find it difficult to fit reading into your day or to get through nonfiction books, try listening to them as audiobooks.
For more organizing books, check out this excellent list compiled by my colleague Darla DeMorrow of HeartWork Organizing: Organizing Books by Pro Organizers.