MLA
Simmons. Portrait of Uncle Gabe, Who Is Dead. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 61. https://digital.library.emory.edu/purl/453wstqjsc-cor.
APA, 6th edition
S. Portrait of Uncle Gabe, who is dead (Box 61) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/453wstqjsc-cor.
Chicago
Simmons. “Portrait of Uncle Gabe, Who Is Dead.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 61. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/453wstqjsc-cor.