MLA
Unidentified Man with Trumpet. Stuart A. Rose Manuscript, Archives, and Rare Book Library, OP91. https://digital.library.emory.edu/purl/023vt4b8j1-cor.
APA, 6th edition
Unidentified man with trumpet (OP91). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/023vt4b8j1-cor.
Chicago
“Unidentified Man with Trumpet.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. OP91. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/023vt4b8j1-cor.