Engelman. The Selected Papers of Margaret Sanger, Volume 4. University of Illinois Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEngelman. The Selected Papers of Margaret Sanger, Volume 4. University of Illinois Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEngelman. The Selected Papers of Margaret Sanger, Volume 4. University of Illinois Press.
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