Não informado. (1978). World Health Statistics Quarterly. World Health Organization.
Chicago-Zitierstil (17. Ausg.)Não informado. World Health Statistics Quarterly. Geneva, Suíça: World Health Organization, 1978.
MLA-Zitierstil (8. Ausg.)Não informado. World Health Statistics Quarterly. World Health Organization, 1978.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.