Não informado. (2001). Bulletin of the World Health Organization. World Health Organization.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the World Health Organization. Geneva, Suíça: World Health Organization, 2001.
MLA-referens (8:e uppl.)Não informado. Bulletin of the World Health Organization. World Health Organization, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.