M. Zain, E. M. Putri, R. W.S.N, .-. Erpomen, and M. Makmur, “Effects of Supplementing Gliricidia Sepium on Ration based Ammoniated Rice Straw in Ruminant Feed to Decrease Methane Gas Production and to Improve Nutrient Digestibility (In-Vitro)”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 10, no. 2, pp. 724–729, Apr. 2020.