MLA
Boy Scouts and Their Leader Standing in Formation, Wearing Uniforms and Hats, on a Brick Road, next to Railroad Tracks. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 69. https://digital.library.emory.edu/purl/180vq83bp8-cor.
APA, 6th edition
Boy Scouts and their leader standing in formation, wearing uniforms and hats, on a brick road, next to railroad tracks (Box 69). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/180vq83bp8-cor.
Chicago
“Boy Scouts and Their Leader Standing in Formation, Wearing Uniforms and Hats, on a Brick Road, next to Railroad Tracks.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 69. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/180vq83bp8-cor.