1. (2010) The State Pharmacopoeia Commission of P. R. China. People's Medical Publishing House: Beijing, China, pp. 296-297.
2. (2006) General Rules for Crude Drugs. (15th edn), Japanese Pharmacopoeia, Tokyo, pp. 1344-1345.
3. (2001) European Directorate for the Quality of Medicines. (4th edn), European Pharmacopoeia, Strasbourg, pp.1858-1859.
4. WHO (1991) Monographs on Selected Medicinal Plants. World Health Organization, Geneva, pp. 231-240.
5. Huang KC (1993) The Pharmacology of Chinese Herbs. CRC Press, pp. 544.