Trance-Formations by Richard Bandler...
Anything of him's good stuff, basically.
And also; to get an understanding into the theme of hypnosis and such; Monsters and Magical Sticks: There's no Such Thing As Hypnosis?
by Steven Heller and Terry Steele.
It's even got an introduction by all time favorite genius of the previous century; Robert Anton Wilson.
If you manage to find videos from seminars or audio of Richard Bandler, these can give you an image of how powerfully hypnosis and NLP etc. can be when fully trained.
Also; Kenrick Cleveland is a brilliant source for NLP teachings.