Nobakht, A., M. Shivazad, M. Chamany, and A.R. Safameher. 2007. “The Effects of Dietary Electrolyte Balance on the Performance and Eggshell Quality in the Early Laying Period”. Pakistan Journal of Nutrition 6 (6): 543–546. https://doi.org/10.3923/pjn.2007.543.546.