1. Screening of some Indian medicinal plants for their antimicrobial properties;Ahmad;Journal of Ethnopharmacology,1998
2. Andreev, N. et al., 1992. Opredelitel na vishite rastenia v Balgaria (in Bulgarian). Nauka i izkustvo, Sofia
3. Wildpflanzen Südeuropas (in German);Burnie,1996
4. An ethnobotanical study of medicinal and aromatic plants in the Natural Park of “Serra de São Mamede” (Portugal);Camejo-Rodrigues;Journal of Ethnopharmacology,2003
5. Deutscher Arzneimittel-Codex and Band 2, 2007. Govi-Verlag Pharmazeutischer Verlag GmbH, Eschborn Deutscher Apotheker Verlag, Stuttgart (in German).