Engelman. The Selected Papers of Margaret Sanger, Volume 4. University of Illinois Press.
芝加哥风格引文Engelman. The Selected Papers of Margaret Sanger, Volume 4. University of Illinois Press.
MLA引文Engelman. The Selected Papers of Margaret Sanger, Volume 4. University of Illinois Press.
警告：这些引文格式不一定是100％准确.