Scientifically credible texts on how to perform Hypnosis What are some scientifically credible texts (preferably free and online) that I could read to learn more about Hypnosis.

While hypnosis is a real phenomenon, there seems to be a lot pseudoscience practitioners in the area as well.

Note: I'm looking more for a text book type work explaining how hypnosis works then studies providing evidence for it. It should of course be supported by studies, but its main purpose should be instruction.
For scientifically supported texts, I would recommend the textbooks produced by the American Society of Clinical Hypnosis (linked here) as a good place to start. None of these are free (legally), though.

They also produce a bibliography of articles and books (currently some 9 pages) that provide some additional handy references.