• [Wiki] http://en.wikipedia.org/wiki/Ambystoma_opacum.
• [amphibiaweb] https://amphibiaweb.org/cgi/amphib_query?rel-common_name=like&where-scientific_name=Ambystoma+opacum.
• [ADW] http://animaldiversity.org/accounts/Ambystoma_opacum/.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Ambystoma_opacum.
• [agefotostock] https://www.agefotostock.com/age/en/details-photo/marbled-salamander-mole-salamander-ambystoma-opacum-cutout-usa/BWI-BS445796.
• [srelherp] https://srelherp.uga.edu/salamanders/ambopa.htm.
• [Keen1975] Keen, W. H. (1975). Breeding and larval development of three species of Ambystoma in central Kentucky (Amphibia: Urodela). Herpetologica, 31(1):18--21.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.