Amazon is a great place to begin.
Check out the books of O'Conner. I have all of then- they demystify the mysteries of mysterious NLP. Great stuff!
If you can, get all the books of Michael Hall and his partner, Bobby. They're even better than the Essential Skills products. Plus, they're cheap
Avoid Persuasion Engineering and the early books of Bandler. They'll drive you nuts and create a mental fog you'll fail to dispel
