Archer , Gregory S. 2015. “Timing of Light Exposure During Incubation to Improve Hatchability, Chick Quality and Post-Hatch Well-Being in Broiler Chickens: 21 or 18 Days”. International Journal of Poultry Science 14 (5): 293–299. https://doi.org/10.3923/ijps.2015.293.299.