APA (7th ed.) Zitazioa

World Health Organization. (1990). Facts about WHO. World Health Organization.

Chicago Style (17th ed.) Zitazioa

World Health Organization. Facts About WHO. Switzerland: World Health Organization, 1990.

MLA (9th ed.) Zitazioa

World Health Organization. Facts About WHO. World Health Organization, 1990.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.