MLA
Family on Porch with Horse and African American Man on Side. 1876. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 13. https://digital.library.emory.edu/purl/194hmgqnrt-cor.
APA, 6th edition
Family on porch with horse and African American man on side (Box 13). (1876). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/194hmgqnrt-cor.
Chicago
“Family on Porch with Horse and African American Man on Side.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, 1876. Box 13. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/194hmgqnrt-cor.