• [Wiki] http://en.wikipedia.org/wiki/Apalone_spinifera.
• [ADW] http://animaldiversity.org/accounts/Apalone_spinifera/.
• [aboutanimals] https://www.aboutanimals.com/reptile/spiny-softshell-turtle/.
• [arkive] http://www.arkive.org/spiny-softshell-turtle/apalone-spinifera/.
• [virhs] http://www.virginiaherpetologicalsociety.com/reptiles/turtles/eastern-spiny-softshell/eastern_spiny_softshell.php.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [PlumMill2015] Plummer, M. V. and Mills, N. E. (2015). Growth and maturity of spiny softshell turtles (Apalone spinifera) in a small urban stream. Herpetological Conservation and Biology, 10(2):688--694.