G. Wu, P. Gunawardana, M. Bryant, and D. Roland, Sr., “Effect of Dietary Energy and Protein on Performance, Egg Composition, Egg Solids, Egg Quality and Profits of Hy-Line W-36 Hens During Phase 2”, Int. J. Poult. Sci., vol. 6, no. 10, pp. 739–744, Sep. 2007, doi: 10.3923/ijps.2007.739.744.