N. C. Johnson, V. M. Ogbamgba, і J. T. Mbachiantim, «A Review on Maize (Zea mays) Nutritive Value and Exogenous Enzymes Needed for Optimal Digestibility in Non-Ruminants Diets, such as Poultry», EJSIT, вип. 2, вип. 1, с. 50-53, Лют 2022.