Abdul Malik, Izza, Farizah Fadzil, Farihah Fadzil, and Roslinda Seswoya. “Assessment of Specific Methanogenic Activity from Cow Dung”. International Journal of Integrated Engineering 14, no. 9 (December 15, 2022): 81–87. Accessed July 23, 2024. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/11405.