Não informado. (1969). Research in Reproduction. International Planned Parenthood Federation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Research in Reproduction. London: International Planned Parenthood Federation, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Research in Reproduction. International Planned Parenthood Federation, 1969.
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