Alvionita, Feni, Muhammad Faizal, Leily Nurul Komariah, and Muhammad Said. “Biogas Production from Palm Oil Mill Effluent With Indigenous Bacteria”. International Journal on Advanced Science, Engineering and Information Technology 9, no. 6 (December 29, 2019): 2060–2066. Accessed July 23, 2024. https://ijaseit.insightsociety.org/index.php/ijaseit/article/view/10462.