Não informado. (2001). Bulletin of the World Health Organization. World Health Organization.
Chicago-Zitierstil (17. Ausg.)Não informado. Bulletin of the World Health Organization. Geneva, Suíça: World Health Organization, 2001.
MLA-Zitierstil (8. Ausg.)Não informado. Bulletin of the World Health Organization. World Health Organization, 2001.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.