MLA
Vass, S. N. (Samuel Nathaniel), 1866-. The progress of the Negro race. 1906. African American Imprints Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/706g1jwv19-cor.
APA, 6th edition
Vass, S. N. (Samuel Nathaniel), 1866-. (1906)[The progress of the Negro race]. African American Imprints Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/706g1jwv19-cor.
Chicago
Vass, S. N. (Samuel Nathaniel), 1866-, The progress of the Negro race, 1906, African American Imprints Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/706g1jwv19-cor.