Eb.Fisch. (Skan) 1990 - Fischer E (1990) Contributions to the Flora of Central Africa IV: New Species of Crepidorhopalon E. Fischer (Scrophulariaceae) from Zaire and Tanzania. Bulletin Du Jardin Botanique National De Belgique 60: 409-413. doi: 10.2307/3668231.
There is no corrections for Crepidorhopalon bifolius yet.