Sagala, Donar, Evi Frimawaty, and Ahyahudin Sodri. “Discovering the Potential of Renewable Energy from Palm Oil Mill Effluent: Environmental Impacts, Opportunities, and Challenges in the Development of Biogas and Bio-Cng”. Bioculture Journal 2, no. 2 (January 31, 2025): 106–122. Accessed April 13, 2025. https://journal-iasssf.com/index.php/Bioculture/article/view/1295.