Idowu, O.M.O., et al. “Modulation of Cholesterol and Copper Residue Levels in Muscles and Blood Serum of Finishing Broiler Chickens Fed Copper and Ascorbic Acid Supplements”. Pakistan Journal of Nutrition, vol. 10, no. 8, July 2011, pp. 781–785, https://doi.org/10.3923/pjn.2011.781.785.