MLA
Eugene and Joe Brown, Posing with Stringed Instruments in Camp Gievres. 1913. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 20. https://digital.library.emory.edu/purl/634sj3txp3-cor.
APA, 6th edition
Eugene and Joe Brown, posing with stringed instruments in Camp Gievres (Box 20). (1913). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/634sj3txp3-cor.
Chicago
“Eugene and Joe Brown, Posing with Stringed Instruments in Camp Gievres.” Photographic postcards. Langmuir Deposit - Sept 2020, 1913. Box 20. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/634sj3txp3-cor.