Lepun, Philip, Tunung Robin, and Ribka Alan. “Distribution, Growth Habit and Morphological Characteristics of Piper Borneense N.E.Br. Varieties in Sarawak, Malaysia”. Journal of Asian Scientific Research 12, no. 3 (August 18, 2022): 123–134. Accessed April 26, 2024. https://archive.aessweb.com/index.php/5003/article/view/4582.