• [Wiki] http://en.wikipedia.org/wiki/Calotriton_asper.
• [amphibiaweb] https://amphibiaweb.org/cgi/amphib_query?rel-common_name=like&where-scientific_name=Calotriton+asper.
• [AnAge] https://genomics.senescence.info/species/entry.php?species=Calotriton_asper.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [Mont1990] Montori, A. (1990). Skeletochronological results in the pyrenean newt Euproctus asper (Dugès, 1852) from one prepyrenean population. Annales des Sciences Naturelles - Zoologie et Biologie Animale, 13(11):209--211. doi:10.1007/s10682-014-9717-8.