MLA
An African American Boy and Girl, Both Wearing Coats and Hats, Standing next to Each Other. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/40644j0zr2-cor.
APA, 6th edition
An African American boy and girl, both wearing coats and hats, standing next to each other (Box 72). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/40644j0zr2-cor.
Chicago
“An African American Boy and Girl, Both Wearing Coats and Hats, Standing 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/40644j0zr2-cor.