Coffman, L. D. (1939). Freedom through education. University of Minnesota.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCoffman, Lotus Delta. Freedom Through Education. Minneapolis: University of Minnesota, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCoffman, Lotus Delta. Freedom Through Education. University of Minnesota, 1939.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.