Khajali, Fariborz, and Hasan Nasiri Moghaddam. 2006. “Methionine Supplementation of Low-Protein Broiler Diets: Influence Upon Growth Performance and Efficiency of Protein Utilization”. International Journal of Poultry Science 5 (6): 569–573. https://doi.org/10.3923/ijps.2006.569.573.