Davis, A. P. “Six Species of Psilanthus Transferred to Coffea (Coffeeae, Rubiaceae)”. Phytotaxa 10, no. 1 (October 28, 2014): 41–45. Accessed September 1, 2025. https://phytotaxa.mapress.com/pt/article/view/phytotaxa.10.1.6.