Frost (2006). „The Amphibian Tree of Life”. Bulletin of the American Museum of Natural History297, 1–370, appendices. o. DOI:[0001:TATOL2.0.CO;2 10.1206/0003-0090(2006)297[0001:TATOL]2.0.CO;2]. ISSN0003-0090.
worldcat.org
Frost (2006). „The Amphibian Tree of Life”. Bulletin of the American Museum of Natural History297, 1–370, appendices. o. DOI:[0001:TATOL2.0.CO;2 10.1206/0003-0090(2006)297[0001:TATOL]2.0.CO;2]. ISSN0003-0090.