MLA
Wilson, George. A Plea for the Abandoned. [publisher not identified], 1890. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3074tmpgzn-cor.
APA, 6th edition
Wilson, G. (1890). A plea for the abandoned [African American pamphlet., African American author.]. [publisher not identified]; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3074tmpgzn-cor.
Chicago
Wilson, George. “A Plea for the Abandoned.” African American pamphlet., African American author. African American Imprints Collection. [United States]: [publisher not identified], 1890. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3074tmpgzn-cor.