Não informado. (1972). Current literature in family planning. Planned Parenthood Federation of America.
Chicago-Zitierstil (17. Ausg.)Não informado. Current Literature in Family Planning. New York: Planned Parenthood Federation of America, 1972.
MLA-Zitierstil (8. Ausg.)Não informado. Current Literature in Family Planning. Planned Parenthood Federation of America, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.