MokogintaI., HapsyariF., and SuprayudiM. A., “The Improvement of Protein Retention through a Higher Utilization of Carbohydrate in the Diet with Chromium for Common Carp Cyprinus carpio Linn.”, Jurnal Akuakultur Indonesia, vol. 3, no. 2, pp. 37-41, Aug. 2007.