Frost, Darrel R. (2014). „Hypopachus variolosus (Cope, 1866)”. Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Приступљено 28. 3. 2014.
amphibiaweb.org
„Hypopachus variolosus”. AmphibiaWeb: Information on amphibian biology and conservation. [web application]. Berkeley, California: AmphibiaWeb. 2014. Приступљено 28. 3. 2014.