Cita APA (7a ed.)

Litwack, L. F. (1961). North of slavery: The Negro in the free States, 1790-1860. University of Chicago Press.

Cita Chicago Style (17a ed.)

Litwack, Leon F. North of Slavery: The Negro in the Free States, 1790-1860. [Chicago]: University of Chicago Press, 1961.

Cita MLA (9a ed.)

Litwack, Leon F. North of Slavery: The Negro in the Free States, 1790-1860. University of Chicago Press, 1961.