1. Akerele O (1992) WHO guidelines for the assessment of herbal medicines. Fitoterapia LXIII(2):99–110
2. Baser KHC, Kirimer N, Ermin N, Kürkçüoglu M, Tümen G (1996) Essential oils from four chemotypes of Thymus zygioides Griseb. var. lycaonicus (Celak) Ronniger. J Essent Oil Res 8(6):615–618
3. Bennett BC, Balick MJ (2008) Phytomedicine 101: plant taxonomy for preclinical and clinical medicinal plant researchers. J Soc Integr Oncol 6(4):150
4. Bennett RN, Wallsgrove RM (1994) Secondary metabolites in plant defence mechanisms. New Phytol 127(4):617–633
5. Bernáth J, Hornok L (1992) Environmental factors. In: Hornok L (ed) Cultivation and processing of medicinal plants. Akadémiai Kiadó, Budapest, pp 56–68