Haryanto, Agus, Laily Rahmadani Putri, Siti Suharyatun, and Mareli Telaumbanua. “Penambahan Arang Batok Kelapa Pada Produksi Biogas Campuran Kotoran Ayam Dan Kotoran Sapi”. Jurnal Agricultural Biosystem Engineering 2, no. 1 (February 18, 2023): 98–108. Accessed October 17, 2025. https://jurnal.fp.unila.ac.id/index.php/ABE/article/view/6874.