^Chen J, Wang F, Liu J, Lee FS, Wang X, Yang H (April 2008). "Analysis of alkaloids in Coptis chinensis Franch by accelerated solvent extraction combined with ultra performance liquid chromatographic analysis with photodiode array and tandem mass spectrometry detections". Analytica Chimica Acta. 613 (2): 184–95. doi:10.1016/j.aca.2008.02.060. PMID18395058.
^Hakim, Sohrab A. E.; Mijović, Valerie; Walker, James (1961). "Distribution of Certain Poppy-Fumaria Alkaloids and a Possible Link with the Incidence of Glaucoma". Nature. 189 (4760): 198–201. doi:10.1038/189198a0. PMID13710637.
^Tang J, Feng Y, Tsao S, Wang N, Curtain R, Wang Y (October 2009). "Berberine and Coptidis rhizoma as novel antineoplastic agents: a review of traditional use and biomedical investigations". Journal of Ethnopharmacology. 126 (1): 5–17. doi:10.1016/j.jep.2009.08.009. hdl:10722/127599. PMID19686830.