Oguri, E.; Tagane, S.; Dang, V.-S.; Yang, C.-J.; Toyama, H.; Tran, H.; Murakami, N.; Yahara, T. A New Species of Gynochthodes (Rubiaceae), G. Honbaensis From Hon Ba Nature Researve, Southern Vietnam. Phytotaxa 2019, 406, 213–217.