Taylor, C. M. (1985). A revision of the Central American species of Monnina (Polygalaceae). Rhodora, 87(850), 159–188. http://www.jstor.org/stable/23314590
Standley, P.C., Steyermark, J.A. (1949). Flora of Guatemala. Fieldiana. Botany 4(1). United States: Chicago Natural History Museum.