Heyer, W.R. 1983. Variation and systematics of frogs of the Genus Cycloramphus (Amphibia, Leptodactylidae) . Arquivos de Zoologia. 30, 4 (Jul. 1983), 235–339. DOI:https://doi.org/10.11606/issn.2176-7793.v30i4p235-339.