• [Wiki] http://en.wikipedia.org/wiki/Gymnogeophagus.
• [fishbase] https://www.fishbase.se/summary/Gymnogeophagus-lacustris.html.
• [HartBrus1998] Hartz, S. M., Bruschi-Junior, W., and Formehl, M. V. (1998). Idade e crescimento de Gymnogeophagus lacustris Reis & Malabarba, um Cichlidae endémico de bacia hidrográfica do Rio Tramandaí, Rio Grande do Sul, Brazil. Revta bras.Zool., 15(3):605--612.
• [HartPere1999] Hartz, S. M., Peret, A. C., and Barbieri, G. (1999). Reproduction of Gymnogeophagus lacustris (Reis & Malabarba, 1988), an endemic Neotropical cichlid of Southern Brazil. Ichthyological Exploration of Freshwaters, 10:247--253.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [VerbLamp2011] Verba, J. T., Lampert, V. R., and Azevedo, M. A. (2011). Reproductive traits of Gymnogeophagus labiatus (Teleostei, Cichlidae), in an upper stretch of Sinos river, Caraá, Brazil. Iheringia, Série Zoologia, Porto Alegre, 101(3):200--206.