Purswell, J.L., J.D. Davis, B.D. Luck, E.J. Kim, H.A. Olanrewaju, A.S. Kiess, and S.L. Branton. 2011. “Effects of Elevated Carbon Dioxide Concentrations on Broiler Chicken Performance from 28 to 49 Days”. International Journal of Poultry Science 10 (8): 597–602. https://doi.org/10.3923/ijps.2011.597.602.