R. C.  Drewes, ?A case of paraphyly in the genus Kassina Girard, 1853 (Anura: Hyperoliidae)?, South African Journal of Science, vol. 81, pp. 186-191, 1985.

M.  Tandy and Drewes, R. C., ?Mating calls of the ?Kassinoid? genera Kassina, Kassinula, Phlyctimantis and Tornierella (Anura: Hyperoliidae)?, South African Journal of Science, vol. 81, pp. 191-195, 1985.

M. J.  Largen and Drewes, R. C., ?A new genus and species of brevicipitine frog (Amphibia, Anura, Microhylidae) from high altitude in the mountains of Ethiopia?, Tropical Zoology, vol. 2, pp. 13-30, 1989.

R. C.  Drewes and Altig, R., ?Anuran egg predation and heterocannibalism in a breeding community of East African frogs?, Tropical Zoology, vol. 9, pp. 333-347, 1996.

R. C.  Drewes and Vindum, J. V., ?Amphibians of the Impenetrable Forest, Southwest Uganda?, Journal of African Zoology, vol. 108, pp. 55-70, 1994.

A. M.  Wieczorek, Drewes, R. C., and Channing, A., ?Phylogenetic relationships within the Hyperolius viridiflavus complex (Anura: Hyperoliidae), and comments on taxonomic status?, Amphibia-Reptilia, vol. 22, pp. 155-166, 2001.

R. C.  Drewes and Perret, J. - L., ?A new species of giant, montane Phrynobatrachus (Anura: Ranidae) from the central mountains of Kenya?, Proceedings of the California Academy of Sciences, vol. 52, pp. 55-64, 2000.

M.  Pickersgill and Drewes, R. C., ?Phrynobatrachus sulfureogularis?, In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. , 2004.

R. C.  Drewes and Pickersgill, M., ?Phrynobatrachus versicolor?, In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. , 2004.

M.  Pickersgill and Drewes, R. C., ?Phrynobatrachus bequaerti?, In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. , 2004.

M.  Pickersgill and Drewes, R. C., ?Phrynobatrachus acutirostris?, In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. , 2004.

J. - L.  Amiet, Burger, M., and Drewes, R. C., ?Phrynobatrachus africanus?, In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. , 2004.

R. C.  Drewes and Pickersgill, M., ?Phrynobatrachus asper?, In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.1. , 2004.

D. R.  Frost, Grant, T., Faivovich, J., Bain, R. H., Haas, A., Haddad, C. F. B., De Sa, R. O., Channing, A., Wilkinson, M., Donnellan, S. C., Raxworthy, C. J., Campbell, J. A., Blotto, B. L., Moler, P., Drewes, R. C., Nussbaum, R. A., Lynch, J. D., Green, Dm, and Wheeler, W. C., ?The amphibian tree of life?, Bulletin of the American Museum of Natural History, vol. 297, pp. 8-291, 2006.

J. C.  Uyeda, Drewes, R. C., and Zimkus, B. M., ?The California Academy of Sciences Gulf of Guinea expeditions (2001,2006) VI. A new species of Phrynobatrachus from the Gulf of Guinea islands and a reanalysis of Phrynobatrachus dispar and P. feae (Anura: Phrynobatrachidae)?, Proceedings of the California Academy of Sciences, vol. 58, pp. 367-385, 2007.