• [Wiki] http://en.wikipedia.org/wiki/Urobatis_halleri.
• [fishbase] https://www.fishbase.se/summary/Urolophus-halleri.html.
• [floridamuseum] https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/urobatis-halleri/.
• [HaleLowe2008] Hale, L. F. and Lowe, C. G. (2008). Age and growth of the round stingray Urobatis halleri at Seal Beach, California. Journal of Fish Biology, 73:510--523. doi:10.1111/j.1095-8649.2008.01940.x.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.