MLA
Old Man with Walking Stick Sitting under Sign That Says Railroad. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 16. https://digital.library.emory.edu/purl/197xksn0dc-cor.
APA, 6th edition
Old man with walking stick sitting under sign that says Railroad (Box 16). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/197xksn0dc-cor.
Chicago
“Old Man with Walking Stick Sitting under Sign That Says Railroad.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 16. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/197xksn0dc-cor.