MLA
Two of a Kind : Two African American Boys Standing against a Wall [Hand Colored]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/825x69p8g5-cor.
APA, 6th edition
Two of a kind : two African American boys standing against a wall [hand colored] (Box 72). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/825x69p8g5-cor.
Chicago
“Two of a Kind : Two African American Boys Standing against a Wall [Hand Colored].” 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/825x69p8g5-cor.