APA (7th ed.) Zitazioa
World Health Organization & ebrary, Inc. (2007). World health statistics 2007. World Health Organization.
Chicago Style (17th ed.) Zitazioa
World Health Organization eta Inc ebrary. World Health Statistics 2007. Geneva, Switzerland: World Health Organization, 2007.
MLA (9th ed.) Zitazioa
World Health Organization eta Inc ebrary. World Health Statistics 2007. World Health Organization, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.