[@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}
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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,
 address = {Johannesburg},
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 publisher = {Southern Book Publishers and Witwatersrand University Press},
 title = {South African Frogs, 2nd Edition},
 year = {1995}
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,@article{596,
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 title = {A review of the amphibians of Natal},
 volume = {39},
 year = {1989}
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,@book{1301,
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 publisher = {Delta Books},
 title = {Frogs of South Africa, 2nd edition},
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,@article{3070,
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,@electronic{3442,
 address = {http://research.amnh.org/herpetology/amphibia/index.html},
 author = {Frost, D.R.},
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 title = {Amphibian Species of the World: an Online Reference. Version 6.0},
 year = {2015}
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,@electronic{11700,
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 volume = {10},
 year = {1989}
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,@book{54649,
 address = {Frankfurt am Main},
 author = {Channing, A. and Howell, K.M.},
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 title = {Amphibians of East Africa},
 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},
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 year = {2003}
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,@article{54659,
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 journal = {Memoirs de Instituto de Investigação Científica de Moçambique Ser. A. Ciencas B},
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 title = {Amphibia of northern Mozambique},
 volume = {8},
 year = {1966}
}
,@article{54659,
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 volume = {53},
 year = {2004}
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 year = {1996}
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,@article{55279,
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,@book{55279,
 address = {Libreville, Gabon},
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 title = {Liste des Amphibiens d'Afrique Centrale},
 year = {2000}
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,@article{55279,
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,@article{55281,
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 year = {2000}
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,@book{55281,
 address = {Frankfurt am Main},
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 title = {Herpetofauna of the West Africa. Volume 1. Amphibians of the West African Savannas},
 year = {2000}
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,@article{56236,
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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.},
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 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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,@article{58128,
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 year = {1964}
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,@article{58128,
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,@article{58128,
 author = {Rödel, M.-O. and Agyei, A.C.},
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,@article{58174,
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 volume = {125},
 year = {1963}
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,@inbook{58174,
 address = {Bonn},
 author = {},
 booktitle = {The herpetofauna of the Central African Republic, with description of a new species of <i>Rhinotyphlops</i> (Serpentes: Typhlopidae)},
 editor = {Joger, U.},
 pages = {85--102},
 publisher = {Museum Alexandrer Koenig},
 title = {Vertebrates in the Tropics},
 year = {1990}
}
,@article{58296,
 author = {Amiet, J.-L.},
 journal = {Année Biologique},
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 pages = {73--136},
 title = {Quelques aspects de la biologie des Amphibiens Anoures du Cameroun},
 volume = {28},
 year = {1989}
}
,@article{58296,
 author = {Amiet, J.-L.},
 journal = {Annales de la Faculté des sciences du Cameroun},
 pages = {109--128},
 title = {Voix d'Amphibiens camerounais. IV - Raninae: genres <i>Ptychadena, Hildebrantia</i> et <i>Dicroglossus</i>},
 volume = {18},
 year = {1974}
}
,@article{58296,
 author = {Joger, U. and Lambert, M.R.K.},
 journal = {Journal of African Zoology},
 pages = {21--51},
 title = {Analysis of the herpetofauna of the Republic of Mali. I. Annotated inventory, with description of a new <i>Uromystax</i> (Sauria: Agamidae)},
 volume = {110},
 year = {1996}
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,@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{58516,
 author = {Lawson, D.P.},
 journal = {Herpetological Natural History},
 number = {2},
 pages = {27--90},
 title = {The reptiles and amphibians of the Korup National Park Project, Cameroon},
 volume = {1},
 year = {1993}
}
,@article{58516,
 author = {Rödel, M.-O., Gil, M., Agyei, A.C., Leaché, A.D., Diaz, R.E., Fujita, M.K. and Ernst, R.},
 journal = {Salamandra},
 pages = {107--127},
 title = {The amphibians of the forested parts of south-western Ghana},
 volume = {41},
 year = {2005}
}
,@article{58516,
 author = {Lamotte, M.},
 journal = {Bulletin de l'Institution Fondamental d'Afrique Noire},
 pages = {218--294},
 title = {Les batraciens de la region de Gpakobo (Cote d'Ivoire)},
 volume = {(A)29},
 year = {1967}
}
,@article{58516,
 author = {Lamotte, M.},
 journal = {Mem. Inst. Fond. Afr. Noire},
 pages = {420--426},
 title = {Le parc national du Niokolo-Koba, Fasciule III; XXX. Amphibiens (deuxieme note)},
 volume = {84},
 year = {1969}
}
,@article{58516,
 author = {Joger, U.},
 journal = {Bonner Zoologische Beiträege},
 number = {32},
 pages = {297--340},
 title = {Zur Herpetofaunistik Westafrikas},
 year = {1981}
}
,@article{58516,
 author = {Gruschwitz, M., Lenz, S. and Böhme, W.},
 journal = {Herpetofauna},
 number = {13(74)},
 pages = {13--22},
 title = {Zur Kenntnis der Herpetofauna von Gambia (Westafrika), Teil 1: Einfurhrung, Froschlurche (Amphibia, Anura), Schildkroten (Reptilia, Chelonia), Krokodile (Crocodilia) und Echsen (Sauria)},
 year = {1991}
}
,@article{58516,
 author = {Schiøtz, A.},
 journal = {Vinensk. Medd. Fra Dansk Naturh. Foren.},
 number = {131},
 pages = {105--108},
 title = {On a collection of amphibia from Liberia and Guinea},
 year = {1968}
}
,@article{58516,
 author = {Barbault, R. and Rodrigues, M.T.},
 journal = {Terre Vie},
 number = {32},
 pages = {441--452},
 title = {Observations sur la reproduction et le dynamique des populations de quelques anoures tropicaux. I. Ptychadena macarthyensis et Ptychadena oxyrhynchus},
 year = {1978}
}
,@article{58516,
 author = {Dehling J. M. and Sinsch U.},
 journal = {ZooKeys },
 pages = {69--102},
 title = {Diversity of <i>Ptychadena</i> in Rwanda and taxonomic status of <i>P. chrysogaster</i> Laurent, 1954 (Amphibia, Anura, Ptychadenidae)},
 volume = {356},
 year = {2013}
}
,]