Pendry, Colin A., and Frits Adema. “Polygala obliqua Pendry, a new species of Polygalaceae from northern Thailand”. Thai Forest Bulletin (Botany), no. 41 (November 24, 2014): 41–44. accessed March 29, 2025. https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24099.