Coto, Cesar, S. Cerate, Z. Wang, F. Yan, and P.W. Waldroup. 2010. “Effect of Source and Level of Maternal Vitamin D on Carryover to Newly Hatched Chicks”. International Journal of Poultry Science 9 (7): 613–622. https://doi.org/10.3923/ijps.2010.613.622.