WIJAYANGGO, Anggit, et al. “Carbon Emission Reduction Potential and Economic Valuation of Biogas at Cengkir Gading Edufarm in Boyolali ”. International Journal of Environmental, Sustainability and Social Science, vol. 4, no. 3, May 2023, pp. 879-85, doi:10.38142/ijesss.v4i3.579.