1. W. Tang and G.Eisenbrand, Chinese Drugs of Plant Origin, Springer, Berlin, Heidelberg, 1992, pp. 855–875
2. WHO Monographs on Selected Medicinal Plants, World Health Organization, Geneva, 1999, pp. 231–240
3. Kee Chang Huang and W. MichaelWilliams, The Pharmacology of Chinese Herbs, CRC Press, Boca Raton, FL, 1993, pp. 185–186
4. Pharmacopoeia of PR China, The State Pharmacopoeia Commission of PR China, Chemical Industry Press, Beijing, 2010, pp. 22–23
5. European Pharmacopoeia, European Directorate for the Quality of Medicines, Council of Europe, Strasbourg, 7th edn, 2011, pp. 2363–2364