1. [1] Makino, T.: Makino's New Illustrated Flora of Japan (Revised Edition). Hokuryukan, Tokyo, pp. 126, 1989. (in Japanese)
2. [2] Hsu, H.-Y., Chen, Y.-P., Shen, S.-J., Hsu, C.-S., Chen, C.-C., and Chang, H.-C.: Oriental Healing Arts Institute, in Oriental Materia Medica.: A Concise Guide, Long Beach, pp. 421, 1986.
3. [3] Bensk, D. and Gamble, A.: in Chinese Herbal Medicine: Materia Medica, (Complied and translated by Benskey, D. and Gramble, A. with Kaptchuk, T.), Eastland Press, Seattle, pp. 341, 1986.
4. [4] Huang, K.C.: in The Pharmacology of Chinese Herbs, Boca Raton: CRC Press, p. 147, 1993.
5. [5] Duke, J.A. and Ayensu, E.S.: Medical Plants of China, vol. 2, Algonac: Reference Publication Inc., pp. 390, 1985.