APA (7th ed.) Zitazioa
World Health Organization & ebrary, Inc. (2007). Global age-friendly cities: A guide. World Health Organization.
Chicago Style (17th ed.) Zitazioa
World Health Organization eta Inc ebrary. Global Age-friendly Cities: A Guide. Geneva: World Health Organization, 2007.
MLA (9th ed.) Zitazioa
World Health Organization eta Inc ebrary. Global Age-friendly Cities: A Guide. World Health Organization, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.