1. Chevallier, A. (1996).An excellent guide to over 500 of the more well known medicinal herbs from around the world. The encyclopedia of medicinal plants, Dorling Kindersley, London.
2. Adams, R.P. (2001).Identification of essential oil components by gas chromatograph/quadrupolemass spectroscopy. Allured Publishing Corporation, Carol Stream, Illinois, USA.
3. Jennings, W. and Shibamoto, T. (1980).Qualitative analysis of flavour and fragrance volatile by glass capillary gas chromatography. Academic Press, New York, NY.