T.  Barbour and Loveridge, A., ?Some undescribed frogs and a new gecko from Liberia?, Proceedings of the New England Zoological Club, vol. 10, pp. 13-18, 1927.

A.  Schiøtz, ?The voices of some West African amphibians?, Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening, vol. 127, pp. 35-83, 1964.