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Xing, Yan, Hong-yun Peng, Meng-xi Zhang, Xia Li, Wei-wei Zeng, and Xiao-e Yang. Caffeic Acid Product From the Highly Copper-tolerant Plant Elsholtzia Splendens Post-phytoremediation: Its Extraction, Purification, and Identification. Zhejiang University Press, 2012.

Xing, Yan, et al. Caffeic Acid Product From the Highly Copper-tolerant Plant Elsholtzia Splendens Post-phytoremediation: Its Extraction, Purification, and Identification. Zhejiang University Press, 2012.