Middleton, David J., and Thawatchai Santisuk. “A New Species of Wrightia (Apocynaceae: Apocynoideae) from Thailand”. Thai Forest Bulletin (Botany), no. 29 (December 15, 2014): 1–10. Accessed August 9, 2022. https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24862.