Fekadu, Tewodros, et al. “Effects of Feeding Graded Levels of Dietary Metabolizable Energy and Crude Protein on the Growth Performance of DZ-White Chicken Strain”. International Journal of Livestock Research, vol. 12, no. 4, Apr. 2022, pp. 7-16, http://ijlr.org/ojs_journal/index.php/ijlr/article/view/54.