Não informado. (1969). Family Planning Perspectives. Allan Guttmacher Institute.
Chicago (17e ed.) BronvermeldingNão informado. Family Planning Perspectives. New York: Allan Guttmacher Institute, 1969.
MLA (8e ed.) BronvermeldingNão informado. Family Planning Perspectives. Allan Guttmacher Institute, 1969.
Let op: Deze citaties zijn niet altijd 100% accuraat.