MLA
Harris, E. G. A Portrait of an African American Girl Baby in a Dress. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/996k0p2njw-cor.
APA, 6th edition
Harris, E. G. A portrait of an African American girl baby in a dress (Box 72) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/996k0p2njw-cor.
Chicago
Harris, E. G. “A Portrait of an African American Girl Baby in a Dress.” 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/996k0p2njw-cor.