Dyfyniad APA

Fenner, F. (1988). Smallpox and its eradication. World Health Organisation.

Dyfyniad Arddull Chicago

Fenner, F. Smallpox and Its Eradication. Geneva: World Health Organisation, 1988.

Dyfyniad MLA

Fenner, F. Smallpox and Its Eradication. World Health Organisation, 1988.

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