MLA
Four African American Children, Two Sitting on a White Wall, Two Standing behind It [Hand Colored]. 1909. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/0515mkkwjx-cor.
APA, 6th edition
Four African American children, two sitting on a white wall, two standing behind it [hand colored] (Box 72). (1909). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0515mkkwjx-cor.
Chicago
“Four African American Children, Two Sitting on a White Wall, Two Standing behind It [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, 1909. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0515mkkwjx-cor.