El-Seedi HR, De Smet PA, Beck O, Possnert G, Bruhn JG. Prehistoric peyote use: alkaloid analysis and radiocarbon dating of archaeological specimens of Lophophora from Texas. J Ethnopharmacol. October 2005, 101 (1-3): 238–42. PMID 15990261. doi:10.1016/j.jep.2005.04.022.
Zimmerman, Allan D.; Parfitt, Bruce D. Lophophora williamsii. Flora of North America Editorial Committee, eds. 1993+ (编). Flora of North America 4. New York & Oxford: Oxford University Press. 2006: 242 [2010-10-19]. (原始内容存档于2012-03-11).
El-Seedi HR, De Smet PA, Beck O, Possnert G, Bruhn JG. Prehistoric peyote use: alkaloid analysis and radiocarbon dating of archaeological specimens of Lophophora from Texas. J Ethnopharmacol. October 2005, 101 (1-3): 238–42. PMID 15990261. doi:10.1016/j.jep.2005.04.022.
Zimmerman, Allan D.; Parfitt, Bruce D. Lophophora williamsii. Flora of North America Editorial Committee, eds. 1993+ (编). Flora of North America 4. New York & Oxford: Oxford University Press. 2006: 242 [2010-10-19]. (原始内容存档于2012-03-11).