Geoffrey Burchfield (1997). "What's your poison: caffeine". Australian Broadcasting Corporation. Diarkibkan daripada yang asal pada 26 July 2009. Dicapai pada 15 January 2014.
Bergström, CA; Andersson, SB; Fagerberg, JH; Ragnarsson, G; Lindahl, A (16 June 2014). "Is the full potential of the biopharmaceutics classification system reached?". European Journal of Pharmaceutical Sciences. 57: 224–31. doi:10.1016/j.ejps.2013.09.010. PMID24075971.
Sobiecki, Jean-Francois (July 2012). "Psychoactive Spiritual Medicines and Healing Dynamics in the Initiation Process of Southern Bantu Diviners". Journal of Psychoactive Drugs. 44 (3): 216–223. doi:10.1080/02791072.2012.703101. PMID23061321.
"Prehistoric peyote use: alkaloid analysis and radiocarbon dating of archaeological specimens of Lophophora from Texas". J Ethnopharmacol. 101 (1–3): 238–42. October 2005. doi:10.1016/j.jep.2005.04.022. PMID15990261.
"Comparing drug classification systems". AMIA Annual Symposium Proceedings: 1039. 6 November 2008. PMID18999016.
Bergström, CA; Andersson, SB; Fagerberg, JH; Ragnarsson, G; Lindahl, A (16 June 2014). "Is the full potential of the biopharmaceutics classification system reached?". European Journal of Pharmaceutical Sciences. 57: 224–31. doi:10.1016/j.ejps.2013.09.010. PMID24075971.
Sobiecki, Jean-Francois (July 2012). "Psychoactive Spiritual Medicines and Healing Dynamics in the Initiation Process of Southern Bantu Diviners". Journal of Psychoactive Drugs. 44 (3): 216–223. doi:10.1080/02791072.2012.703101. PMID23061321.
"Prehistoric peyote use: alkaloid analysis and radiocarbon dating of archaeological specimens of Lophophora from Texas". J Ethnopharmacol. 101 (1–3): 238–42. October 2005. doi:10.1016/j.jep.2005.04.022. PMID15990261.
Geoffrey Burchfield (1997). "What's your poison: caffeine". Australian Broadcasting Corporation. Diarkibkan daripada yang asal pada 26 July 2009. Dicapai pada 15 January 2014.