Frost, Darrel R. (2020). «Pristimantis variabilis (Lynch, 1968)». Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Consultado em 21 de março de 2020
Lynch, John D. (1968). «Two new frogs of the genus Eleutherodactylus from eastern Ecuador (Amphibia: Leptodactylidae)». Journal of Herpetology. 2 (3/4): 129–135. JSTOR1563112. doi:10.2307/1563112
Lynch, John D. (1968). «Two new frogs of the genus Eleutherodactylus from eastern Ecuador (Amphibia: Leptodactylidae)». Journal of Herpetology. 2 (3/4): 129–135. JSTOR1563112. doi:10.2307/1563112