Middleton, David J., and Pramote Triboun. “Two New Species of Petrocosmea (Gesneriaceae) from Thailand”. Thai Forest Bulletin (Botany), no. 38 (November 26, 2014): 42–47. Accessed March 29, 2024. https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24348.