Não informado. (1972). Abortion Surveillance. Center for Disease Control.
Chicago (17e ed.) BronvermeldingNão informado. Abortion Surveillance. Atlanta, Ga: Center for Disease Control, 1972.
MLA (8e ed.) BronvermeldingNão informado. Abortion Surveillance. Center for Disease Control, 1972.
Let op: Deze citaties zijn niet altijd 100% accuraat.