Mago, O. Y. T.; Nirmalasari, M. A. Y.; Kuki, A. D.; Bunga, Y. N.; Misa, A. Effect of the Type of Organic Waste and Retention Time on Biogas Production from Cow Dung. Biota : Jurnal Ilmiah Ilmu-Ilmu Hayati 2021, 5, 155-162.