Ahmad, Shakeel, Ahsan-ul-Haq, Muhammad Yousaf, and Haq Nawaz. 2010. “Effect of Feeding Canola Oil and Vitamin A on the Fatty Acid Profile of Egg Yolks in Laying Hens”. Pakistan Journal of Nutrition 9 (2): 191–194. https://doi.org/10.3923/pjn.2010.191.194.