Khanal, R.C., and K.C. Olson. “Factors Affecting Conjugated Linoleic Acid (CLA) Content in Milk, Meat, and Egg: A Review”. Pakistan Journal of Nutrition, vol. 3, no. 2, Feb. 2004, pp. 82-98, https://doi.org/10.3923/pjn.2004.82.98.