Pattharahirantricin, Nannapat. 2014. “The genus Rhynchoglossum Blume (Gesneriaceae) in Thailand”.
Thai Forest Bulletin (Botany)
, no. 42 (December):24-34. https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24909.