DjokosetiyantoD., SunarmaA. and Widanarni. (2007) “Changes of Ammonia, Nitrite and Nitrate at Recirculation System of Red Tilapia (Oreochromis sp.) Rearing”, Jurnal Akuakultur Indonesia, 5(1), pp. 13-20. doi: 10.19027/jai.5.13-20.