Não informado. (1969). Family Planning Perspectives. Allan Guttmacher Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Family Planning Perspectives. New York: Allan Guttmacher Institute, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Family Planning Perspectives. Allan Guttmacher Institute, 1969.
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