Rabden, Rinchen, et al. “Design, a Study of Laboratory-Scale Experimentation and Economic Analysis of Biogas Plant for Phuentsholing Area”. Zorig Melong | A Technical Journal of Science, Engineering and Technology, vol. 5, no. 1, June 2021, pp. 50-55, http://103.133.216.217/index.php/zm/article/view/53.