Frost, Darrel R. (2014). "Hypopachus Keferstein, 1867". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 22 March 2014.
Firneno, T. J., Jr., M. W. Itgen, J. L. Jacobs, C. X. Mcdaniels, I. R. Luque-Montes, L. D. Wilson, and J. H. Townsend. 2021. Integrating phylogenetics, morphology, and osteology to delimit a new species of endemic montane sheep frog (Microhylidae: Hypopachus) from the Lenca Highlands of Honduras. Systematics and Biodiversity 19: 186–208 (https://doi.org/10.1080/14772000.2020.1841325).