World Health Organization. (2012). World health statistics 2012. World Health Organization.
Chicago-referens (17:e uppl.)World Health Organization. World Health Statistics 2012. Geneva, Switzerland: World Health Organization, 2012.
MLA-referens (8:e uppl.)World Health Organization. World Health Statistics 2012. World Health Organization, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.