[@book{596,
 address = {Ithaca and London},
 author = {Channing, A.},
 publisher = {Cornell University Press},
 title = {Amphibians of Central and Southern Africa},
 year = {2001}
}
,@book{596,
 address = {Frankfurt am Main},
 author = {Pickersgill, M.},
 publisher = {Edition Chimaira},
 title = {Frog Search. Results of Expeditions to Southern and Eastern Africa.},
 year = {2007}
}
,@book{596,
 address = {Washington, D.C.},
 author = {Minter, L.R., Burger, M., Harrison, J.A., Braack, H.H., Bishop, P.J. and Knoepfer, D.},
 publisher = {SI/MAB Series No. 9},
 title = {Atlas and Red Data Book of the Frogs of South Africa, Lesotho and Swaziland},
 year = {2004}
}
,@book{596,
 address = {Johannesburg},
 author = {Passmore, N.I. and Carruthers, V.C.},
 publisher = {Southern Book Publishers and Witwatersrand University Press},
 title = {South African Frogs, 2nd Edition},
 year = {1995}
}
,@article{596,
 author = {Lambiris, A.J.L.},
 journal = {Lammergeyer},
 pages = {1--210},
 title = {A review of the amphibians of Natal},
 volume = {39},
 year = {1989}
}
,@electronic{596,
 address = {http://www.iucnredlist.org},
 author = {IUCN},
 title = {IUCN Red List of Threatened Species (ver. 2013.2)},
 year = {2013}
}
,@electronic{596,
 address = {http://research.amnh.org/herpetology/amphibia/index.html},
 author = {Frost, D.R.},
 publisher = {American Museum of Natural History},
 title = {Amphibian Species of the World: an Online Reference. Version 5.6 (9 January 2013). Electronic Database},
 year = {2013}
}
,@book{1301,
 address = {Craighall},
 author = {Wager, V.A.},
 publisher = {Delta Books},
 title = {Frogs of South Africa, 2nd edition},
 year = {1986}
}
,@article{11700,
 author = {Poynton, J.C.},
 journal = {Annals of the Natal Museum},
 pages = {1--334},
 title = {The amphibia of southern Africa: a faunal study},
 volume = {17},
 year = {1964}
}
,@article{54636,
 author = {Broadley, D.G.},
 journal = {Puku},
 pages = {1--143},
 title = {The reptiles and amphibians of Zambia},
 volume = {6},
 year = {1971}
}
,@article{54636,
 author = {Lambiris, A.J.L.},
 journal = {Museo Regionale di Scienze Naturali Torino, Monografia},
 pages = {1--247},
 title = {The frogs of Zimbabwe},
 volume = {10},
 year = {1989}
}
,@book{54649,
 address = {Frankfurt am Main},
 author = {Channing, A. and Howell, K.M.},
 publisher = {Edition Chimaira},
 title = {Amphibians of East Africa},
 year = {2006}
}
,@article{54649,
 author = {Largen, M.J.},
 journal = {Tropical Zoology},
 pages = {307--402},
 title = {Catalogue of the amphibians of Ethiopia, including a key for their identification},
 volume = {14},
 year = {2001}
}
,@article{54649,
 author = {Poynton, J.C.},
 journal = {Senckenbergiana Biologica},
 pages = {193--225},
 title = {Amphibia of the Nyasa-Luangwa region of Africa},
 volume = {45},
 year = {1964}
}
,@article{54649,
 author = {Lötters, S., Rotich, D., Koester, T.E., Kosuch, J., Muchai, V., Scheelke, K., Schick, S., Teege, P., Wasonga, V.D. and Veith, M.},
 journal = {Salamandra},
 number = {2/3},
 pages = {165--179},
 title = {What do we know about the amphibians from the Kenyan central and western highlands? A faunistic and taxonomic review},
 volume = {42},
 year = {2006}
}
,@book{54659,
 address = {Albany},
 author = {Stewart, M.M.},
 publisher = {State University of New York Press},
 title = {Amphibians of Malawi},
 year = {1967}
}
,@article{54659,
 author = {Poynton, J.C.},
 journal = {Systematics and Biodiversity},
 pages = {117--126},
 title = {Altitudinal species turnover in southern Tanzania shown by anurans: some zoogeographical considerations},
 volume = {1},
 year = {2003}
}
,@article{54659,
 author = {Ruas, C.},
 journal = {Garcia de Orta. Ser. Zool. (Lisboa)},
 pages = {19--41},
 title = {Contribuicao para o conhecimento da fauna de batraquios de Angola},
 volume = {21},
 year = {1996}
}
,@book{56236,
 address = {Nairobi and Mainz},
 author = {Lötters, S., Wagner, P., Bwong, B.A., Schick, S., Malonza, P.K., Muchai, V., Wasonga, D.V. and Veith, M.},
 publisher = {National Museums of Kanya and University of Mainz},
 title = {A Fieldguide to the Amphibians and Reptiles of the Kakamega Forest},
 year = {2007}
}
,@article{58066,
 author = {Poynton, J.C. and Broadley, D.G.},
 journal = {Annals of the Natal Museum},
 pages = {115--181},
 title = {Amphibia Zambesiaca. 2. Ranidae},
 volume = {27},
 year = {1985}
}
,@article{58128,
 author = {Schmidt, K.P. and Inger, R.F.},
 journal = {Exploration du Parc National de l'Upemba},
 pages = {1--264},
 title = {Amphibians},
 volume = {56},
 year = {1959}
}
,@article{58490,
 author = {Largen, M.J.},
 journal = {Tropical Zoology},
 pages = {223--246},
 title = {Two new species of <i>Ptychadena</i> Boulenger 1917 (Amphibia, Anura, Ranidae) from Ethiopia, with observations on other members of the genus recorded from this country and a tentative key for their identification},
 volume = {10},
 year = {1997}
}
,@article{58490,
 author = {Poynton, J.C.},
 journal = {Annals of the Natal Museum},
 pages = {365--375},
 title = {Guide to the <i>Ptychadena</i> (Amphibia:Ranidae) of the southern third of Africa},
 volume = {20},
 year = {1970}
}
,@phdthesis{58490,
 author = {Passmore, N.I.},
 school = {University of Witwatersrand, Johannesburg},
 title = {Vocalizations and aspects of the reproductive behaviour of the genus <i>Ptychadena</i> in South Africa},
 year = {1978}
}
,@article{58511,
 author = {Passmore, N.I.},
 journal = {South African Journal of Science},
 number = {73},
 pages = {212--214},
 title = {Mating calls and other vocalizations of five species of Ptychadena (Anura: Ranidae)},
 year = {1977}
}
,@article{58519,
 author = {Stewart, M.M. and Wilson, V.J.},
 journal = {Annals of the Natal Museum},
 number = {18},
 pages = {287--314},
 title = {Herpetofauna of the Nyika Plateau (Malawi and Zambia)},
 year = {1966}
}
,]