• [Wiki] https://en.wikipedia.org/wiki/Cyclocheilichthys_apogon.
• [fishbase] https://www.fishbase.se/summary/Cyclocheilichthys-apogon.
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• [WatsBalc1985] Watson, D. J. and Balon, E. K. (1985). Determination of age and growth in stream fishes of northern Borneo. Environmental Biology of Fishes, 13(1):59–70. doi:10.1007/bf00004856.