- Ang-Lee, M.K., Moss, J. and Yuan, C.S., 2001. Herbal medicines and perioperative care. The Journal of the American Medical Association, 286(2): 208-216.
- Bach, N., Thung, S.N. and Schaffner, F., 1989. Comfrey herb tea-induced hepatic Veno-occlusive disease. The American journal of Medicine, 87(1): 97-99.
- Barrett, B., Kiefer, D. and Rabago, D., 1999. Assessing the risks and benefits of herbal medicine: an overview of scientific evidence. Alternative therapies in health and medicine,, 5(4): 40-49.
- Egan, C.D., 2002. Addressing the use of herbal medicine in the primary care setting. Journal of the AmericanAcademy of Nurse Practitioners, 14(4): 166-171.
- Fungh-Berman, A., 2002. Herbal supplements: Indications, clinical concerns, and safety. Nutrition today, 37(30): 122-124.
- Glostonbury, J.R., Doughty, F.R., Whitaker, S.J. and Sergeant, E., 1984. A syndrome of hepatogenous photosensitisation, resembling geeldikkop, in sheep grazing Tribulus Terrestris. Australian veterinary journal, 61(10): 314-316.
- Haroun, M.E., Mohmoud, O.M. and Adam S.E., 2002. Effect of feeding Cuminum cyminum fruits, Thymus vulgaris leaves or their mixture to rats. Veterinary and human toxicology, 44(2): 67-69.
- Mcintyre, M., 2000. A review of the benefits, adverse events, drug interactions, and safety of St. John's Wort (Hypericum perforatum): the implications with regard to the regulation of herbal medicines. Journal of alternative complementary medicine, 6(2) 115-124.
- Ozbek, H., Ugras, S., Dulger, H., Bayram, I., Tuncer, I., Ozturk, G. and Ozturk, A., 2003. Hepatoprotective effects of foeniculum Vulgare essential oil. Fitoterapia, 74(3): 317-319.
- Sangeeta, D., Sidhu, H., Thind, S.K. and Nath, R., 1994. Effect of Tribulus Terrestris on oxalate Metabolism in rats. Journal of Ethnophormcology , 44(2): 61-66.
- Shad, J.A., Chin, C.G. and Brane, O.S., 1999. Acute hepatitis after ingestion of herbs. Southern medical journal, 92(11): 1095-1097.
- Tapia, M., O-Giordono, M.A. and Grouper, H.G., 1994. An outbreak of hepatogenous photosensitization in Sheep grazing Tribulus Terrestris in Argentina. Veterinary and human toxicology, 36(4): 311-313.