O. Alabi, A. Shoyombo, O. Akpor, O. Oluba, and A. Adeyonu, “Exogenous Enzymes and the Digestibility of Nutrients by Broilers: A Mini Review”, Int. J. Poult. Sci., vol. 18, no. 9, pp. 404–409, Aug. 2019, doi: 10.3923/ijps.2019.404.409.