E. B.  Harper, Measey, G. J., Patrick, D. A., Menegon, M., and Vonesh, J. R., Field Guide to Amphibians of the Eastern Arc Mountains and Coastal Forests of Tanzania and Kenya. Nairobi, Kenya: Camerapix Publishers International, 2010, p. 320.

S. P.  Loader, Gower, D. J., Ngalason, W., and Menegon, M., ?Three new species of Callulina (Amphibia: Anura: Brevicipitidae) highlight local endemism and conservation plight of Africa?s Eastern Arc forests?, Zoological Journal of the Linnean Society, vol. 160, pp. 496-514, 2010.