Literature

Authors	ปี	ชื่อ
Z. Zhou, Jiang, S. - H., Zhu, D. - Y., Lin, L. - Z., Cordell, G. A.	1994	Anthraquinones from Knoxia valerianoides
Y. B. Wang, Zhao, J. F., Li, G. P., Yang, J. H., Li, L.	2004	[Studies on the chemical constituents of Knoxia corymbosa].
F. Zhao, Wang, S. - J., Lin, S., Zhu, C. - G., Yuan, S. - P., Ding, X. - Y., Yue, Z. - G., Yu, Y., Liu, B., Wu, X. - L., others	2011	Anthraquinones from the roots of Knoxia valerianoides

The genus Knoxia and note on Duperrea (Rubiaceae) in Thailand