Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Warning: These citations may not always be 100% accurate.