Vorenberg, Michael (Summer 1993). "Abraham Lincoln and the Politics of Black Colonization". Journal of the Abraham Lincoln Association. 14 (2). hdl:2027/spo.2629860.0014.204. ISSN1945-7987.
Magness, Phillip W. (September 2011). "James Mitchell and the Mystery of the Emigration Office Papers". Journal of the Abraham Lincoln Association. 32 (2). hdl:2027/spo.2629860.0032.205. ISSN1945-7987.
Vorenberg, Michael (Summer 1993). "Abraham Lincoln and the Politics of Black Colonization". Journal of the Abraham Lincoln Association. 14 (2). hdl:2027/spo.2629860.0014.204. ISSN1945-7987.
Magness, Phillip W. (September 2011). "James Mitchell and the Mystery of the Emigration Office Papers". Journal of the Abraham Lincoln Association. 32 (2). hdl:2027/spo.2629860.0032.205. ISSN1945-7987.