Landon, Fred (). „The Negro migration to Canada after the passing of the fugitive slave act”. The Journal of Negro History. 5 (1): 22–36. doi:10.2307/2713499. JSTOR2713499.
Landon, Fred (). „The Negro migration to Canada after the passing of the fugitive slave act”. The Journal of Negro History. 5 (1): 22–36. doi:10.2307/2713499. JSTOR2713499.
Elbert, Sarah, ed. (). „Introduction”. The American prejudice against color: William G. Allen, Mary King, and Louisa May Alcott. Boston: Northeastern University Press(d). ISBN9781555535452.
Noralee Frankel, "Breaking the Chain: 1860–1880", in Robin D. G. Kelley(d) & Earl Lewis(d) (eds), To Make Our World Anew (Vol. I: A History of African Americans to 1880, Oxford University Press, 2000: paperback edn 2005), pp. 230–231.