Frost, Darrel R. (2014). "Strongylopus Tschudi, 1838". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 3 May 2014.
amphibiaweb.org
"Pyxicephalidae". AmphibiaWeb: Information on amphibian biology and conservation. [web application]. Berkeley, California: AmphibiaWeb. 2014. Retrieved 3 May 2014.