MLA
Autographed Cabinet Card Photograph of Abolitionist and United States Politician Cassius Marcellus Clay. 1870. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 23, Folder 36. https://digital.library.emory.edu/purl/177fqz62b1-cor.
APA, 6th edition
Autographed cabinet card photograph of abolitionist and United States politician Cassius Marcellus Clay (Box 23, Folder 36). (1870). [Cabinet photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/177fqz62b1-cor.
Chicago
“Autographed Cabinet Card Photograph of Abolitionist and United States Politician Cassius Marcellus Clay.” Cabinet photographs. Civil War Collection, 1870. Box 23, Folder 36. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/177fqz62b1-cor.