Zain, Mardiati, et al. “Effect of Defaunation and Supplementation Methionine Hydroxy Analogue and Branched Chain Amino Acid in Growing Sheep Diet Based on Palm Press Fiber Ammoniated”. Pakistan Journal of Nutrition, vol. 7, no. 6, Oct. 2008, pp. 813–816, https://doi.org/10.3923/pjn.2008.813.816.