- AmphibiaWeb: Information on amphibian biology and conservation. [web application]. 2010. Berkeley, California: AmphibiaWeb. http://amphibiaweb.org/. (Accessed: Sep 22, 2010).
- DECO (ed) (2006) Dictionary of Alien Species. Tokyo-Shoseki. (in Jpn)
- Frost (2009) Amphibian Species of the World: an Online Reference. Version 5.3. http://research.amnh.org/herpetology/amphibia/ . AMNH, New York, USA.
- JWRC (ed) (2008) A Photographic Guide to the Invasive Alien Species in Japan. Heibonsha. (in Jpn)
- Nagasaka (ed) (1996) Picture Book of Reptiles & Amphibians. Pisces, Tokyo. (in Jpn)
- etc.
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