Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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