Não informado. (1976). Advance Data from Vital & Health Statistics. National Center for Health Statistics.
Chicago-Zitierstil (17. Ausg.)Não informado. Advance Data from Vital & Health Statistics. Hyattsville, Md: National Center for Health Statistics, 1976.
MLA-Zitierstil (8. Ausg.)Não informado. Advance Data from Vital & Health Statistics. National Center for Health Statistics, 1976.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.