De Wilde, Willem J.J.O., and Brigitta E.E. Duyfjes. “The Lesser-Sized Lobelias of Asia and Malesia”. Thai Forest Bulletin (Botany), no. 40 (November 24, 2014): 38–56. Accessed August 19, 2022. https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24127.