Syamsuri, Yustia Wulandari Mirzayanti, Wiwik Widyo Widjajanti, and Samuel Kristian Bani. “Pengaruh Variasi Konsentrasi NaOH Sebagai Nutrisi Pada Performansi Biogas Tipe Portabel”. Journal of Research and Technology 6, no. 2 (December 30, 2020): 195–207. Accessed March 9, 2021. https://journal.unusida.ac.id/index.php/jrt/article/view/353.