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 address = {Ithaca and London},
 author = {Channing, A.},
 publisher = {Cornell University Press},
 title = {Amphibians of Central and Southern Africa},
 year = {2001}
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,@book{596,
 address = {Frankfurt am Main},
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 publisher = {Edition Chimaira},
 title = {Frog Search. Results of Expeditions to Southern and Eastern Africa.},
 year = {2007}
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,@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}
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,@book{596,
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 publisher = {Southern Book Publishers and Witwatersrand University Press},
 title = {South African Frogs, 2nd Edition},
 year = {1995}
}
,@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}
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,@book{1301,
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 title = {Frogs of South Africa, 2nd edition},
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,@electronic{11700,
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,@book{54649,
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 year = {2006}
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 year = {2001}
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 year = {1981}
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 title = {Amphibia of the Nyasa-Luangwa region of Africa},
 volume = {45},
 year = {1964}
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 journal = {Salamandra},
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 title = {What do we know about the amphibians from the Kenyan central and western highlands? A faunistic and taxonomic review},
 volume = {42},
 year = {2006}
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,@book{54659,
 address = {Albany},
 author = {Stewart, M.M.},
 publisher = {State University of New York Press},
 title = {Amphibians of Malawi},
 year = {1967}
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,@book{54659,
 author = {Harper, E. and Vonesh, J.R.},
 publisher = {http://www.zoo.ufl.edu/voneshjr/Harper%20&%20Vonesh%20-%20Amphibian%20Guide.pdf},
 title = {Field Guide to the Amphibians of the East Usambara Mountains. Preliminary Draft},
 year = {2003}
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,@article{54659,
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 title = {Amphibia of northern Mozambique},
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 year = {1966}
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 year = {1996}
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,@article{55281,
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,@book{56236,
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 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}
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,@article{58066,
 author = {Poynton, J.C. and Broadley, D.G.},
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 year = {1985}
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,@article{58128,
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 year = {1959}
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,@article{58490,
 author = {Largen, M.J. and Dowsett-Lemaire, F.},
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 volume = {4},
 year = {1991}
}
,@article{58490,
 author = {Schätti, B.},
 journal = {Rev. Suisse Zool.},
 pages = {905--937},
 title = {Amphibien und Reptilien aus der Arabischen Republik Jemen und Djibouti},
 volume = {96},
 year = {1989}
}
,@article{58490,
 author = {Perret, J.-L.},
 journal = {Arquivos do Museo Bocage},
 number = {6},
 pages = {15--34},
 title = {Revision des amphibiens africains et principalement des types conserves au Musee Bocage de Lisbonne},
 volume = {2},
 year = {1976}
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,@article{58490,
 author = {Perret, J.-L.},
 journal = {Bulletin de la Societe Neuchateloise des Sciences Naturelles},
 pages = {5--21},
 title = {Remarques et mise au point sur quelques especes de <i>Ptychadena</i> (Amphibia, Ranidae)},
 volume = {102},
 year = {1979}
}
,@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}
}
,]