1. Lange, D. 1998.Europe's medicinal and aromatic plants, their use, trade and conservation.TRAFFIC International77UK: Cambridge.
2. Bernath, J. 2000.Possibilities and limitations of medicinal plant production in Hungary. First Conference on Medicinal and Aromatic Plants of Southeast European Countries, Arandzelovac, Yugoslavia, May 29-June 3, 2000. Book of Abstracts23
3. Dahler, M. and Pelzmann, H. 1999.Arznei-und Gewürzpflanzen31–33. Klosterneuburg: Anbau, Ernte, Aufbereitung. sterreichischer Agrarverlag.
4. Bomme, U. 1998.The Cultivation of Medicinal Plants-New Trends and Investigations. 46th Annual Congress Society for Medicinal Plant Research “Quality of Medicinal Plants and Herbal Medicinal Products,” August 31st-Sep 4th, 1998, Vienna, Austria4 Abstracts of Plenary Lectures