APA Zitierstil

(2002). WHO marks 25th anniversary of last naturally acquired smallpox case.

Chicago Zitierstil

WHO Marks 25th Anniversary of Last Naturally Acquired Smallpox Case. 2002.

MLA Zitierstil

WHO Marks 25th Anniversary of Last Naturally Acquired Smallpox Case. 2002.

Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.