MLA
Meet Us at Capitol Isl. : Two African American Boys Holding Bags next to Each Other. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/883xsj3v0h-cor.
APA, 6th edition
Meet us at Capitol Isl. : two African American boys holding bags next to each other (Box 72). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/883xsj3v0h-cor.
Chicago
“Meet Us at Capitol Isl. : Two African American Boys Holding Bags next to Each Other.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/883xsj3v0h-cor.