• [Wiki] http://en.wikipedia.org/wiki/Urobatis_halleri.
• [fishbase] https://www.fishbase.se/summary/Urobatis-halleri.
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• [HaleLowe2008] Hale, L. F. and Lowe, C. G. (2008). Age and growth of the round stingray Urobatis halleri at Seal Beach, California. J. Fish Biol., 73(3):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.