The Science of Spirit Possession (2nd edition) is now published in a paperback version at a lower costs and for the non-academic reader. Order direct from Cambridge Scholars Publishing.
Self-created thought forms represent a dimension of human consciousness that is largely neglected and ignored by mainstream psychology and psychiatry. This is just one facet of human experience that demands acknowledgement, and here is an article to address this problem. A must read for all SRT practitioners and clients.
Try to ignore the images. This is a radio interview. It is long, but well worth listening to because it reinforces much of what we already know.
Scroll through for photos of the speakers
Here is a link to a ritual that has been recommended for protection from malign forces. http://www.kheper.net/topics/Hermeticism/LBR.htm