Hidayati, W. ., A. Muktiani, and D. Samsudewa. “Effect of Methionine Supplementation on the Production of Friesian Holstein Dairy Cows ”. Journal of Advanced Veterinary Research, vol. 15, no. 5, Oct. 2025, pp. 554-6, https://www.advetresearch.com/index.php/AVR/article/view/2325.