Frost, Darrel R. (2015). "Scaphiopus couchii Baird, 1854". Amphibian Species of the World: an Online Reference. Versio 6.0. American Museum of Natural History. [1] Alirita la 9an de Marto 2017.
ebeltz.net
Beltz, Ellin (15a de Januaro 2007). "Scientific and Common Names of the Reptiles and Amphibians of North America - Explained". [2] Alirita la 9an de Marto 2017.
