MLA
Baseball Team Posing in a Line, Wearing Uniforms, with Their Ball Boy Marcos Sitting in Front of Them. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/187pnvx0nm-cor.
APA, 6th edition
Baseball team posing in a line, wearing uniforms, with their ball boy Marcos sitting in front of them (Box 74). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/187pnvx0nm-cor.
Chicago
“Baseball Team Posing in a Line, Wearing Uniforms, with Their Ball Boy Marcos Sitting in Front of Them.” Photographic 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/187pnvx0nm-cor.