Fenner, Frank, Isao Arita, Donald Ainslie Henderson, Zdenek Jezek, and Ivan Danilovich Ladnyi. “Early efforts at control: variolation, vaccination, and isolation and quarantine.” In Smallpox and its Eradication, 245–276. History of International Public Health No. 6. Switzerland: World Health Organization, 1988.http://whqlibdoc.who.int/smallpox/9241561106.pdf.
An rep A report published by the WHO that details the early vaccination efforts.