1. Blumenthal M, Lindstrom A, Lynch ME, Rea P (2011) Herb sales continue growth-up 3.3% in 2010. Herbalgram 90:64–67
2. Orwa C, Mutua A, Kindt R, Jamnadass R, Anthony S (2009) Agroforestree database: a tree reference and selection guide, version 4.0. http://www.worldagroforestry.org/sites/treedbs/treedatabases.asp
3. Mills S, Bone K (2000) Principles and practice of phytotherapy. Churchill Livingstone, London
4. Schwartz S (2005) Psychoactive herbs in veterinary behavior medicine. Blackwell, Oxford
5. Khan IA, Abourashed EA (2010) Leung’s encyclopedia of common natural ingredients used in food, drugs and cosmetics. Wiley, Hoboken