(EN) National Institute on Drug Abuse, Classical drugs: an introductory overview. Hallucinogens: an update (PDF), in Geraldine C. Lin e Richard A. Glennon (a cura di), NIDA Research Monograph Series, n. 146, Rockville, Maryland, U.S. Department of Health and Human Services - National Institute on Drug Abuse, 1994. URL consultato il 5 settembre 2020.