D. Djokosetiyanto, A. Sunarma, and . Widanarni, “Changes of Ammonia, Nitrite and Nitrate at Recirculation System of Red Tilapia (Oreochromis sp.) Rearing”, Jurnal Akuakultur Indonesia, vol. 5, no. 1, pp. 13–20, Jan. 2007, doi: 10.19027/jai.5.13-20.