K. Roberson, J. Kalbfleisch, W. Pan, and R. Charbeneau, “Effect of Corn Distiller`s Dried Grains with Solubles at Various Levels on Performance of Laying Hens and Egg Yolk Color”, Int. J. Poult. Sci., vol. 4, no. 2, pp. 44–51, Jan. 2005, doi: 10.3923/ijps.2005.44.51.