Already been mentioned, but shall recommend it.

Introducing NLP
Psychological skills for understanding and influencing people

Can be bought from amazon. A easy to follow with plenty of examples.

A good book I read and borrowed from the library was Teach Yourself NLP by Amanda Vickers and some other dude.
It was a bit complicated but it needs studying, better to own than to borrow. Outlines all the fundamentals of NLP which is probably something that you're looking for.