Puff, Christian. “Argostemma Siamense Puff, a New Name for A. Monophyllum Sridith (Rubiaceae)”. Thai Forest Bulletin (Botany), no. 37 (November 26, 2014): 139. Accessed August 9, 2022. https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24343.