MLA
Stead, Jas. U. A Signed Portrait of Pastor Henry Highland Garnet on Aug. 13, 1881. 1881. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 61. https://digital.library.emory.edu/purl/962f7m0ckf-cor.
APA, 6th edition
Stead, J. U. (1881). A signed portrait of Pastor Henry Highland Garnet on Aug. 13, 1881 (Box 61) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/962f7m0ckf-cor.
Chicago
Stead, Jas. U. “A Signed Portrait of Pastor Henry Highland Garnet on Aug. 13, 1881.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, 1881. Box 61. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/962f7m0ckf-cor.