1. Blumenthal, M. (1998).The Complete German Commission E Monographs. American Botanical Council, Austin.
2. Houghton, P.J. (1997).Valerian, the Genus Valeriana. Harwood Academic, Amsterdam.
3. Weiss, R.F. (1998).Herbal Medicine. Beaconsfield Publishers, Beaconsfield.
4. Bos, R. (1997).Analytical and Phytochemical Studies on Valerian and Valerian-based Preparations. State University of Groningen, Groningen.
5. Huang, B.K. (2005).Studies on Pharmacognosy of Valeriana L. and Intraspecific Variation ofValerianin China., Second Military Medical University, Shanghai.