MLA
Koellein, Giers. Portrait of an African American Man with Only Top Button of Overcoat Buttoned. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 62. https://digital.library.emory.edu/purl/549g4f4qv8-cor.
APA, 6th edition
Koellein, G. Portrait of an African American man with only top button of overcoat buttoned (Box 62) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/549g4f4qv8-cor.
Chicago
Koellein, Giers. “Portrait of an African American Man with Only Top Button of Overcoat Buttoned.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 62. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/549g4f4qv8-cor.