Não informado. (1976). Advance Data from Vital & Health Statistics. National Center for Health Statistics.
Chicago (17e ed.) BronvermeldingNão informado. Advance Data from Vital & Health Statistics. Hyattsville, Md: National Center for Health Statistics, 1976.
MLA (8e ed.) BronvermeldingNão informado. Advance Data from Vital & Health Statistics. National Center for Health Statistics, 1976.
Let op: Deze citaties zijn niet altijd 100% accuraat.