Darini, Ririn. “Experience of East Sumatra: Eradication of Disease Outbreaks, 1880”1940s”. MOZAIK HUMANIORA 23, no. 1 (September 14, 2023): 19–33. Accessed October 20, 2024. https://e-journal.unair.ac.id/MOZAIK/article/view/36908.