[@book{596,
 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},
 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}
}
,@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}
}
,@phdthesis{596,
 author = {Jacobsen, N.H.G.},
 school = {Unpublished PhD thesis, University of Natal, Durban},
 title = {A Herpetological Survey of the Transvaal},
 year = {1990}
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,@article{596,
 author = {Lambiris, A.J.L.},
 journal = {Lammergeyer},
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 title = {A review of the amphibians of Natal},
 volume = {39},
 year = {1989}
}
,@book{1301,
 address = {Craighall},
 author = {Wager, V.A.},
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 title = {Frogs of South Africa, 2nd edition},
 year = {1986}
}
,@electronic{3442,
 address = {http://research.amnh.org/herpetology/amphibia/index.html},
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 publisher = {American Museum of Natural History},
 title = {Amphibian Species of the World: an Online Reference. Version 6.0},
 year = {2015}
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,@article{11700,
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 title = {The amphibia of southern Africa: a faunal study},
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 year = {1964}
}
,@electronic{11700,
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 title = {The IUCN Red List of Threatened Species. Version 2016-1},
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,@article{54636,
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,@article{54636,
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 volume = {10},
 year = {1989}
}
,@book{54649,
 address = {Frankfurt am Main},
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 publisher = {Edition Chimaira},
 title = {Amphibians of East Africa},
 year = {2006}
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,@article{54649,
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 year = {1990}
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 title = {A Checklist of the Somali amphibians},
 volume = {10},
 year = {1981}
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,@article{54649,
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 pages = {193--225},
 title = {Amphibia of the Nyasa-Luangwa region of Africa},
 volume = {45},
 year = {1964}
}
,@article{54649,
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 title = {Spatial and temporal patterns of abundance and diversity of an East African leaf litter amphibian fauna},
 volume = {39},
 year = {2007}
}
,@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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,@article{54659,
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,@article{54659,
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 title = {Amphibia of northern Mozambique},
 volume = {8},
 year = {1966}
}
,@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{55281,
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,@article{56236,
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 year = {2006}
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,@article{56236,
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 journal = {Spolia Zoologica Musei Hauniensi},
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 volume = {25},
 year = {1967}
}
,@article{58066,
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,@article{58174,
 author = {Schiøtz, A.},
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 volume = {125},
 year = {1963}
}
,@article{58535,
 author = {Channing, A., Passmore, N.I. and du Preez, L.},
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,@article{58535,
 author = {Parry, C.R.},
 journal = {Annals of the Natal Museum},
 number = {25},
 pages = {281--292},
 title = {A revision of southern African Pyxicephalus Tschudi (Anura: Ranidae)},
 year = {1982}
}
,@article{76317565,
 author = {Padial, J.M. and De La Riva, I.},
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 year = {2004}
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,@article{76317591,
 author = {Böhme, W.},
 journal = {Bonner Zoologische Beiträege},
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 title = {Zur Herpetofaunistik Kameruns, mit Beschreibung eines neuen Scinciden},
 volume = {26},
 year = {1975}
}
,@article{76317591,
 author = {Walker, R.B.},
 journal = {Copeia},
 number = {1968},
 pages = {164--167},
 title = {The amphibians of Zaria, in the northern Guinea Savannah, Nigeria},
 year = {1968}
}
,@article{76317591,
 author = {Amiet, J.-L.},
 journal = {Annales de la faculté des sciences de Yaoundé},
 pages = {63--78},
 title = {Compte rendu d'une mission batrachologique dans le Nord-Cameroun},
 volume = {12},
 year = {1972}
}
,@article{76317591,
 author = {Herrmann, H.-J. and Kabisch, K.},
 journal = {Herpetofauna},
 number = {13(73)},
 pages = {13--17.},
 title = {Haltung und Zucht des Grunen Grabfrosches, Pycicephalus adspersus Tschudi, 1938},
 year = {1991}
}
,@article{76317591,
 author = {Poynton, J.C.},
 journal = {Bull. Mus. Comp. Zool.},
 number = {152},
 pages = {451--473},
 title = {Amphibians of southeastern Tanzania, with special reference to <i>Stephopaedes</i> and <i>Mertensophryne</i> (Bufonidae)},
 year = {1991}
}
,@article{76317591,
 author = {Böhme, W., Wilms, T., Nickel, H.and Merz, M.},
 journal = {Zeitschrift des Kölner Zoo},
 number = {44},
 pages = {117--131},
 title = {Bericht über eine herpetologische Forschungsreise in die westliche Sahara und ihre Randgebiete},
 year = {2001}
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,@article{76317591,
 author = {Walker, B.},
 journal = {Nigerian Field},
 number = {31},
 pages = {177--180},
 title = {An uncommon frog, Pyxicephalus adspersus},
 year = {1966}
}
,@article{76317591,
 author = {Scott, E., Visser, J.D., Yetman, C.A., Oliver, L. and Broadley, D.G.},
 journal = {Zootaxa},
 number = {3},
 pages = {201--228},
 title = {Revalidation of <i>Pyxicephalus angusticeps</i> Parry, 1982 (Anura: Natatanura: Pyxicephalidae), a bullfrog endemic to the lowlands of eastern Africa},
 volume = {3599},
 year = {2013}
}
,]