* Lester Packer, Choon Nam Ong, Barry Halliwell (2004): ''Herbal and Traditional Medicine: Molecular Aspects of Health'', CRC Press, ISBN 0-8247-5436-0 | * Lester Packer, Choon Nam Ong, Barry Halliwell (2004): ''Herbal and Traditional Medicine: Molecular Aspects of Health'', CRC Press, ISBN 0-8247-5436-0 |