MLA
Metcalf, W. L. African American Boys and Girls Posing with Musical Instruments, Bikes and Horses in the Middle of a Street [Hand Colored]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/044bnzs7mt-cor.
APA, 6th edition
Metcalf, W. L. African American boys and girls posing with musical instruments, bikes and horses in the middle of a street [hand colored] (Box 70) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/044bnzs7mt-cor.
Chicago
Metcalf, W. L. “African American Boys and Girls Posing with Musical Instruments, Bikes and Horses in the Middle of a Street [Hand Colored].” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/044bnzs7mt-cor.