Niu, Zhuye, Jin Fu, Yupeng Gao, and Fuzhu Liu. “Influence of Paprika Extract Supplement on Egg Quality of Laying Hens Fed Wheat-Based Diet”. International Journal of Poultry Science 7, no. 9 (August 15, 2008): 887–889. Accessed September 21, 2025. https://ijpsjournal.org/index.php/ijps/article/view/1046.