F.  Nieden, ?Verziechnis der bei Amani in Deutschostafrika vorkommenden Reptilien und Amphibien?, Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin, vol. 1910, pp. 441-452, 1911.

T.  Barbour and Loveridge, A., ?A comparative study of the herpetological faunae of the Uluguru and Usambara Mountains, Tanganyika Territory with descriptions of new species?, Memoirs of the Museum of Comparative Zoology, vol. L, pp. 85-265, 1928.

R. O.  De Sa, Loader, S. P., and Channing, A., ?A new species of Callulina (Anura: Microhylidae) from the West Usambara Mountains, Tanzania?, Journal of Herpetology, vol. 38, pp. 219-224, 2004.

S. P.  Loader, Gower, D. J., Howell, K. M., Doggart, N., Rödel, M. - O., Clarke, B. T., De Sa, R. O., Cohen, B. L., and Wilkinson, M., ?Phylogenetic relationships of African microhylid frogs inferred from DNA sequences of mitochondrial 12S and 16S rRNA genes?, Organisms Diversity & Evolution, vol. 4, pp. 227-235, 2004.

K. M.  Howell, Poynton, J. C., Loader, S., and Menegon, M., ?Callulina kreffti?, In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. , 2004.

A.  Channing, Howell, K., and Loader, S., ?Callulina kisiwamsitu?, In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. , 2006.

S. P.  Loader, Measey, G. J., De Sa, R. O., and Malonza, P. K., ?A new brevicipitid species (Anura: Brevicipitidae: Callulina) from the fragmented forests of the Taita Hills, Kenya?, Zootaxa, vol. 2123, pp. 55-68, 2009.

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.