• [Wiki] https://en.wikipedia.org/wiki/Lytechinus_variegatus.
• [echinobase] http://www.echinobase.org/Echinobase/SpAbout.
• [ADW] http://animaldiversity.org/accounts/Strongylocentrotus_purpuratus/.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [LarsVada1980] Larson, B. R., Vadas, R. L., and Keser, M. (1980). Feeding and nutritional ecology of the sea urchin Strongylocentrotus drobach&nsis in Maine, USA. Marine Biology, 59:49--62.
• [MeidSche1998] Meidel, S. K. and Scheibling, R. E. (1998). Annual reproductive cycle of the green sea urchin, Strongylocentrotus droebachiensis, in differing habitats in Nova Scotia, Canada. Marine Biology, 131:461--478.