Ali, M.N., et al. “Effect of Using Cuminum Cyminum L, Citric Acid and Sodium Sulphate for Improving the Utilization of Low Protein Low Energy Broiler Diets”. International Journal of Poultry Science, vol. 10, no. 7, June 2011, pp. 514–522, https://doi.org/10.3923/ijps.2011.514.522.