Northup, S., & Wilson, D. (2011). Twelve years a slave: Narrative of Solomon Northup, a citizen of New-York, kidnapped in Washington City in 1841, and rescued in 1853. University of North Carolina at Chapel Hill Library : distributed by University of North Carolina Press.

Northup, Solomon, và David Wilson. Twelve Years a Slave: Narrative of Solomon Northup, a Citizen of New-York, Kidnapped in Washington City in 1841, and Rescued in 1853. Chapel Hill: University of North Carolina at Chapel Hill Library : distributed by University of North Carolina Press, 2011.

Northup, Solomon, và David Wilson. Twelve Years a Slave: Narrative of Solomon Northup, a Citizen of New-York, Kidnapped in Washington City in 1841, and Rescued in 1853. University of North Carolina at Chapel Hill Library : distributed by University of North Carolina Press, 2011.