1. Bu, R. 2004. Herbal medicine research of the Mongolian medicine gardenia. Journal of Chinese Medicinal Materials 27:692–694.
2. Cardon, D. 2007. Natural dyes: Sources, tradition, technology and science. Archetype, London.
3. CASFRPSE (Chinese Academy of Sciences “Flora Republicae Popularis Sinicae” Editorial). 1959–2004. Flora Republicae Popularis Sinicae. http://frps.eflora.cn/ . Beijing: Kexue chubanshe.
4. Chen, S., R. Feng, B. Chen, L. Jing, X. Dong, Z. Gu, and S. Wang. 1991. A study on the medicinal plants of genus Rubia. I. Botanical origins and resource of chinese traditional drug “qiancao” (munjeet). Natural Product Research and Development 3:7–15.
5. ———, T. Liu, and K. Liu. 2001. Huangbai [Amur cork tree]. Zhongguo zhongyiyao chubanshe, Beijing.