Butterfield, K. L. (1908). Chapters in rural progress. University of Chicago Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रButterfield, Kenyon L. Chapters in Rural Progress. Chicago: University of Chicago Press, 1908.
एमएलए (8वां संस्करण) प्रशस्ति पत्रButterfield, Kenyon L. Chapters in Rural Progress. University of Chicago Press, 1908.
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