E. McGill, A. Kamyab, and J. Firman, “Low Crude Protein Corn and Soybean Meal Diets with Amino Acid Supplementation for Broilers in the Starter Period. 2. Effects of Feeding 13% Crude Protein”, Int. J. Poult. Sci., vol. 11, no. 3, pp. 166–171, Feb. 2012, doi: 10.3923/ijps.2012.166.171.