Não informado. (1972). Current literature in family planning. Planned Parenthood Federation of America.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Current Literature in Family Planning. New York: Planned Parenthood Federation of America, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Current Literature in Family Planning. Planned Parenthood Federation of America, 1972.
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