Ahmad, S., Ahsan-ul-Haq, Yousaf, M., & Nawaz, H. (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