Smith, D. G. (2013). On the edge of freedom: The fugitive slave issue in south central Pennsylvania, 1820-1870. Fordham University Press.

Smith, David G. On the Edge of Freedom: The Fugitive Slave Issue in South Central Pennsylvania, 1820-1870. New York: Fordham University Press, 2013.

Smith, David G. On the Edge of Freedom: The Fugitive Slave Issue in South Central Pennsylvania, 1820-1870. Fordham University Press, 2013.