Zakaria, H.A., Jalal, M.A. and Jabarin, A.S. (2008) “Effect of Exogenous Enzymes on the Growing Performance of Broiler Chickens Fed Regular Corn/Soybean-Based Diets and the Economics of Enzyme Supplementation”, Pakistan Journal of Nutrition, 7(4), pp. 534–539. doi:10.3923/pjn.2008.534.539.