Ede Frecska:Therapeutic guidelines: dangers and contraindications in therapeutic applications of hallucinogens. In: Michael J. Winkelman, Thomas B. Roberts (Hrsg.): Psychedelic Medicine: New evidence for hallucinogenic substances as treatments. Praeger Publishers, 2007, S.69–96, doi:10.13140/RG.2.1.2364.8888 (englisch).