Sirimongkol, S., J. Parnell, T. Hodkinson, D. Middleton, and C. Puglisi. “Five New Species of Henckelia (Gesneriaceae) from Myanmar and Thailand”. Thai Forest Bulletin (Botany), vol. 47, no. 1, Apr. 2019, pp. 38-54, doi:10.20531/tfb.2019.47.1.08.