Satyantini, Woro H., et al. “Supplementation of Carrot (Daucus Carrota) As Natural Source of Beta-Carotene Prepared by Several Methods in Feed to Increase Blue Colour of Freshwater Crayfish Red Claw (Cherax Quadricarinatus)”. Jurnal Akuakultur Indonesia, vol. 8, no. 1, Feb. 2012, pp. 19-27, https://doi.org/10.19027/jai.8.19-27.