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12"Pyxicephalidae". AmphibiaWeb: Information on amphibian biology and conservation. [web application]. Berkeley, California: AmphibiaWeb. 2014. Retrieved 3 May 2014.
↑Lemierre, Alfred; Folie, Annelise; Bailon, Salvador; Robin, Ninon; Laurin, Michel (4 May 2021). "From toad to frog, a CT-based reconsideration of Bufo servatus, an Eocene anuran mummy from Quercy (France)". Journal of Vertebrate Paleontology. 41 (3) e1989694. Bibcode:2021JVPal..41E9694L. doi:10.1080/02724634.2021.1989694. ISSN0272-4634. S2CID244552296.
↑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.