APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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