MLA
Four African American Boys Sitting. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/566j0zpcbf-cor.
APA, 6th edition
Four African American boys sitting (Box 74). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/566j0zpcbf-cor.
Chicago
“Four African American Boys Sitting.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 74. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/566j0zpcbf-cor.