- Conant & Collins (1991) A Field Guide to Reptiles and Amphibians. Eastern/Central North America 3rd ed.. Houghton Mifflin, Boston.
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- Ministry of the Environment, Japan. The Invasive Alien Species Act (Accessed on 2012-7-04) http://www.env.go.jp/en/nature/as.html
- AmphibiaWeb (Accessed on 2023-8-17) https://amphibiaweb.org/
- Nagasaka (ed) (1996) Picture Book of Reptiles & Amphibians. Pisces (in Jpn)
- Steggins (1985) A Field Guide to Western Reptiles and Amphibians. Houghton Mifflin, Boston.
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