1. Achterberg J. Imagery in healing: Shamanism and modern medicine. Shambhala, Boston, MA 1985
2. An expressive arts model for substance abuse group training and treatment
3. Atwater FH. Brainwave and oxygen-saturation correlates during a ritual induced state of consciousness. 1999, (Available at: www.monroeinstitute.org/research; last accessed 11.01.03)
4. Barter C, Renold E. The use of vignettes in qualitative research. Social Research Update. 1999; 25, (Available at: http://www.soc.surrey.ac.uk/sru/SRU25.html; last accessed 12.05.03)