• [Wiki] http://en.wikipedia.org/wiki/Perccottus_glenii.
• [fishbase] https://www.fishbase.se/summary/Perccottus-glenii.html.
• [ChukGeor2016] Chukwu, K. and George, A. (2016). Growth and mortality of sleeper fish, Bostrychus africanus from upper New Calabar river, Rivers State, Nigeria. Journal of Aquatic Sciences, 31(2B):425--432. doi:10.4314/jas.v31i2B.10.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.