APA引文

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

Chicago Edition Citation

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

MLA引文

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

警告：这些引文格式不一定是100％准确.