Lehr, E., and C. Guilar. “The Taxonomic Status of Phrynopus Pereger Lynch 1975 (Amphibia, Anura, Leptodactylidae)”. Zootaxa, vol. 1284, no. 1, Aug. 2006, pp. 53–60, doi:10.11646/zootaxa.1284.1.3.