BioStor
 | On some Batrachia and Nematognathi brought from the upper Amazon by Prof. Orton E D Cope (1874) Proceedings of the Academy of Natural Sciences, Philadelphia 26: 120-137 |
 | A review of the broad-headed eleutherodactyline frogs of South America (Leptodactylidae) John D Lynch (1975) Occasional Papers of the Museum of Natural History, The University of Kansas 38: 1-46 |