Sanjaya, D. (2015) “BIOGAS PRODUCTION FROM A MIXTURE OF COW MANURE WITH CHICKEN MANURE”, Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering), 4(2). Available at: https://jtep.fp.unila.ac.id/index.php/JTP/article/view/827 (Accessed: 28 June 2026).