MLA
Mayo, A. D. (Amory Dwight), 1823-1907. The opportunity and obligation of the educated class of the Colored race in the Southern States : an address delivered before the Agricultural and Mechanical College for Negroes, at Normal, Alabama, May 29, 1899. 1899. African American Imprints Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/477sn02w8w-cor.
APA, 6th edition
Mayo, A. D. (Amory Dwight), 1823-1907. (1899)[The opportunity and obligation of the educated class of the Colored race in the Southern States : an address delivered before the Agricultural and Mechanical College for Negroes, at Normal, Alabama, May 29, 1899]. African American Imprints Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/477sn02w8w-cor.
Chicago
Mayo, A. D. (Amory Dwight), 1823-1907, The opportunity and obligation of the educated class of the Colored race in the Southern States : an address delivered before the Agricultural and Mechanical College for Negroes, at Normal, Alabama, May 29, 1899, 1899, African American Imprints Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/477sn02w8w-cor.