Gurbuz, Y. et al. 2003. Effects of Addition of the Red Pepper from 4th Harvest to Corn or Wheat Based Diets on Egg-yolk Colour and Egg Production in Laying Hens. International Journal of Poultry Science. 2, 2 (Feb. 2003), 107–111. DOI:https://doi.org/10.3923/ijps.2003.107.111.