World Health Organization. (2000). Healthy ageing development. World Health Organization.
Chicago-referens (17:e uppl.)World Health Organization. Healthy Ageing Development. Geneva: World Health Organization, 2000.
MLA-referens (8:e uppl.)World Health Organization. Healthy Ageing Development. World Health Organization, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.