Blackburn, D. C., & Wake, D. B. (2011).

Class Amphibia Gray, 1825. In: Zhang, Z.-Q. (Ed.) Animal biodiversity: An outline of higher-level classi­fication and survey of taxonomic richness

. Zootaxa, 3148(1), 39–55. https://doi.org/10.11646/zootaxa.3148.1.8