MLA
The Cabin Boys : Three African American Men Playing Various Stringed Instruments in Front of a Microphone. 1948. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/470zpc86bh-cor.
APA, 6th edition
The Cabin Boys : three African American men playing various stringed instruments in front of a microphone (Box 70). (1948). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/470zpc86bh-cor.
Chicago
“The Cabin Boys : Three African American Men Playing Various Stringed Instruments in Front of a Microphone.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1948. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/470zpc86bh-cor.