Leeratiwong, C., P. Chantaranothai, and A. Paton. “Taxonomic Notes on the Genus Premna L. (Lamiaceae) in Thailand”. Thai Forest Bulletin (Botany), Vol. 44, no. 2, Dec. 2016, pp. 122-4, doi:10.20531/tfb.2016.44.2.06.