Frost, Darrel R. (2024). "Ascaphus Stejneger, 1899". Amphibian Species of the World: an Online Reference. Version 6.2. American Museum of Natural History. doi:10.5531/db.vz.0001. Retrieved 2 June 2024.
Frost, Darrel R. (2024). "Ascaphidae Fejérváry, 1923". Amphibian Species of the World: an Online Reference. Version 6.2. American Museum of Natural History. doi:10.5531/db.vz.0001. Retrieved 2 June 2024.
Frost, Darrel R. (2024). "Ascaphus Stejneger, 1899". Amphibian Species of the World: an Online Reference. Version 6.2. American Museum of Natural History. doi:10.5531/db.vz.0001. Retrieved 2 June 2024.
Frost, Darrel R. (2024). "Ascaphidae Fejérváry, 1923". Amphibian Species of the World: an Online Reference. Version 6.2. American Museum of Natural History. doi:10.5531/db.vz.0001. Retrieved 2 June 2024.
Irisarri, I.; Diego, S.M.; Green, D.M.; Zardoya, F. (2010). "The complete mitochondrial genome of the relict frog Leiopelma archeyi: Insights into the root of the frog Tree of Life". Mitochondrial DNA. 21 (5): 173–182. doi:10.3109/19401736.2010.513973.
Green, D.M.; Cannatella, D (1993). "Phylogenetic significance of the amphicoelous frogs, Ascaphidae and Leiopelmatidae". Ethology Ecology & Evolution. 5 (2): 233–245. doi:10.1080/08927014.1993.9523107.