Herawaty, R., N. Jamarun, M. Zain, Arnim, and R.W.S. Ningrat. 2013. “Effect of Supplementation Sacharonyces Cerevisiae and Leucaena Leucocephala on Low Quality Roughage Feed in Beef Cattle Diet”. Pakistan Journal of Nutrition 12 (2): 182–184. https://doi.org/10.3923/pjn.2013.182.184.