"Atropine content of plants". USDA, ARS, National Genetic Resources Program. Phytochemical and Ethnobotanical Databases. [Online Database] National Germplasm Resources Laboratory, Beltsville, Maryland. Archived from the original on November 7, 2004. Retrieved July 25, 2005.
"Cocaine content of plants". USDA, ARS, National Genetic Resources Program. Phytochemical and Ethnobotanical Databases. [Online Database] National Germplasm Resources Laboratory, Beltsville, Maryland. Archived from the original on November 7, 2004. Retrieved July 25, 2005.
web.archive.org
"Atropine content of plants". USDA, ARS, National Genetic Resources Program. Phytochemical and Ethnobotanical Databases. [Online Database] National Germplasm Resources Laboratory, Beltsville, Maryland. Archived from the original on November 7, 2004. Retrieved July 25, 2005.
"Cocaine content of plants". USDA, ARS, National Genetic Resources Program. Phytochemical and Ethnobotanical Databases. [Online Database] National Germplasm Resources Laboratory, Beltsville, Maryland. Archived from the original on November 7, 2004. Retrieved July 25, 2005.