1. British Pharmaceutical Codex; Council of the Pharmaceutical Society of Great Britain: London, 1911; pp 271−272.
2. Duke, J. A.CRC Handbook of Medicinal Herbs; CRC Press: Boca Raton, FL, 1984; p 150.
3. Arctander, S.Perfume and Flavor Materials of Natural Origin; published by the author: Elizabeth, NJ, 1960; p 131.
4. The constituents of cascarilla oil (croton eluteria bennett)