^
abcFrost, Darrel R. (2014).
"Pyxicephalidae Bonaparte, 1850". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 3 May 2014.
^
ab"Pyxicephalidae". AmphibiaWeb: Information on amphibian biology and conservation. [web application]. Berkeley, California: AmphibiaWeb. 2014. Retrieved 3 May 2014.
^Frost, Darrel R. (2014).
"Cacosterninae Noble, 1931". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 3 May 2014.
^Frost, Darrel R. (2014).
"Pyxicephalinae Bonaparte, 1850". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 3 May 2014.