Sutaryo, Sutaryo, et al. “Effect of Different Feeding Management on the Respiratory Methane Emission and Feces-Derived Methane Yield of Goat”. Journal of Advanced Veterinary and Animal Research, vol. 6, no. 4, Nov. 2019, pp. 431-7, https://banglajol.info/index.php/JAVAR/article/view/44110.