1. Kaplan J (1969) Marijuana. Report of the Indian Hemp Drugs Commission, 1893–1894. Thomas Jefferson Publishing Co., Silver Spring, MD
2. Merlin MD (2003) Archaeological evidence for the tradition of psychoactive plant use in the Old World. Econ Bot 57: 295–323
3. Nadkarni KM (1976) Indian material medical. Popular Prakashan, Bombay
4. Kapoor LD (1990) CRC handbook of Ayurvedic Medicinal Plants. CRC Press, Boca Raton, FL
5. Candolle Ad (1883) Origine des plants cultivées. G. Baillière et Cie., Paris