Bibliography
- Bachman, John (1850), The doctrine of the unity of the human race examined on the principles of science, Charleston, S.C.: C. Canning. LC control no. 05029882.
- Desmond, Adrian; Moore, James (2009), Darwin's Sacred Cause: how a hatred of slavery shaped Darwin's views on human evolution, Houghton Mifflin Harcourt. ISBN 978-0-547-05526-8
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