Sridith, Kitichate, and Christian Puff. 2014. “Distribution of Argostemma Wall. (Rubiaceae), With Special Reference to Thailand and Surrounding Areas”. Thai Forest Bulletin (Botany), no. 28 (December):123-37. https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24959.