MLA
Portrait of a Man in a Suit with Eyeglasses Standing with One Arm behind His Back. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 17. https://digital.library.emory.edu/purl/156zw3r2ck-cor.
APA, 6th edition
Portrait of a man in a suit with eyeglasses standing with one arm behind his back (Box 17). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/156zw3r2ck-cor.
Chicago
“Portrait of a Man in a Suit with Eyeglasses Standing with One Arm behind His Back.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 17. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/156zw3r2ck-cor.