Shafie, S. M., Z. Othman, N. Hami, S. Omar, A. H. Nu’man, N. N. Yusoff, and A. Shaf. “Biogas Fed-Fuel Cell Based Electricity Generation: A Life Cycle Assessment Approach”. International Journal of Energy Economics and Policy, vol. 10, no. 5, Aug. 2020, pp. 498-02, https://econjournals.com/index.php/ijeep/article/view/9957.