ดวงใจบุญ กฤติเดช. “Electrical Generation Use by Biogas in a Pig Farm”. Journal of Energy and Environment Technology of Graduate School Siam Technology College 1, no. 1 (July 31, 2014): 20–27. accessed December 10, 2025. https://ph01.tci-thaijo.org/index.php/JEET/article/view/180965.