Smith, D. G. (2013). On the edge of freedom: The fugitive slave issue in south central Pennsylvania, 1820-1870. Fordham University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSmith, David G. On the Edge of Freedom: The Fugitive Slave Issue in South Central Pennsylvania, 1820-1870. New York: Fordham University Press, 2013.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSmith, David G. On the Edge of Freedom: The Fugitive Slave Issue in South Central Pennsylvania, 1820-1870. Fordham University Press, 2013.
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