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Viet Nam. Ministry of Health ,  World Health Organization. Global Commission for the Certification of Smallpox Eradication ,  [Report to the Global Commission for Certification of Smallpox Eradication : Socialist Republic of Viet Nam. annex 6, Data submitted by the government after printing of the initial report / [Ministry of Health, Socialist Republic of Viet Nam]]

World Health Organization ,  World Health Organization. Global Commission for the Certification of Smallpox Eradication ,  [Smallpox eradication in the Republic of Djibouti : status report, 13 November 1978]

World Health Organization ,  World Health Organization. Global Commission for the Certification of Smallpox Eradication ,  [Smallpox eradication in the Republic of Djibouti : status report, 13 November 1978]

Viet Nam. Ministry of Health ,  World Health Organization. Global Commission for the Certification of Smallpox Eradication ,  [Report to the Global Commission for Certification of Smallpox Eradication : Socialist Republic of Viet Nam. annex 6, Data submitted by the government after printing of the initial report / [Ministry of Health, Socialist Republic of Viet Nam]]