Utama, C. S., B. Sulistiyanto, and O. Barus. “PH, Total Bacteria and Total Fungi Litter Fermentation at Different Ripening Durations”. Jurnal Sain Peternakan Indonesia, vol. 16, no. 3, Sept. 2021, pp. 259-65, https://ejournal.unib.ac.id/jspi/article/view/13263.