Larson, Lorne. “Smallpox Outbreaks and Immunization Policies in Tanzania from the Late Nineteenth Century to the First World War”. Zamani: A Journal of African Historical Studies, vol. 1, no. 2, Dec. 2024, pp. 237-59, https://journals.udsm.ac.tz/index.php/zjahs/article/view/6951.