Title: Heart of the Mind
Authors: Connirae Andreas and Steve Andreas
Published: 1989
For me, this is one of the classic NLP books, a beautifully written and very accessible book that explains so many of the key processes in NLP. It is full of real-life examples, and probably most importantly it has many transcripts of actual client sessions and the kind of change language that is assumed but not actually used in many NLP books.