Quang, Bui Hong, and Nguyen The Cuong. “A New Record Species Rothmannia Wittii (Craib) Bremek. (Rubiaceae) for the Flora of Vietnam”. Academia Journal of Biology 37, no. 4 (October 26, 2015): 458–462. Accessed April 26, 2024. https://vjs.ac.vn/index.php/vjbio/article/view/6952.