Fries, Edionei Maico, et al. “Vitamin A Supplementation in Diets for Goldfish (Carassius Auratus)”. Semina: Ciências Agrárias, vol. 35, no. 4, Aug. 2014, pp. 2229-40, doi:10.5433/1679-0359.2014v35n4p2229.