1. , , Herbal Medicine: Expanded Commission E Monographs, American Botanical Council, Austin 2000.
2. , , Herbal Medicines – A Guide for Health-Care Professionals, The Pharmaceutical Press, London 1996.
3. Gastroprotective effects of bitter principles isolated from Gentian root and Swertia herb on experimentally-induced gastric lesions in rats
4. Monoamine oxidase inhibitors from
5. , Phytochemical Dictionary – A Handbook of Bioactive Compounds from Plants, Taylor & Francis, London 1993.