R.Alexander Pyron, John J.Wiens, 2011, A large-scale phylogeny of Amphibia including over 2800 species, and a revised classification of extant frogs, salamanders, and caecilians[1]Arkivigite je 2012-12-18 per la retarkivo Wayback Machine
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R.Alexander Pyron, John J.Wiens, 2011, A large-scale phylogeny of Amphibia including over 2800 species, and a revised classification of extant frogs, salamanders, and caecilians[1]Arkivigite je 2012-12-18 per la retarkivo Wayback Machine