Thapyai, C., P. Wilkin, and K. Chayamarit. “A Rare Endemic Thai Yam Rediscovered: Dioscorea Inopinata Prain & Burkill (Dioscoreaceae) and Its Affinities”. Thai Forest Bulletin (Botany), no. 32, Dec. 2014, pp. 151-8, https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24375.