World Helalth Organization. (2007). Global age-friendly cities: A guide. World Health Organization.
Chicago-referens (17:e uppl.)World Helalth Organization. Global Age-friendly Cities: A Guide. Geneva: World Health Organization, 2007.
MLA-referens (8:e uppl.)World Helalth Organization. Global Age-friendly Cities: A Guide. World Health Organization, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.