Lang, Xue-Dong, Jian-Rong Su, Shu-Gang Lu, and Zhi-Jun Zhang. 2013. “A Taxonomic Revision of the Genus Cephalotaxus (Taxaceae)”. Phytotaxa 84 (1). Auckland, New Zealand:1–24. https://doi.org/10.11646/phytotaxa.84.1.1.