MLA
Eckstone, C. Satisfied with Life : Portrait of an African American Sitting and Smiling. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/491fj6q597-cor.
APA, 6th edition
Eckstone, C. Satisfied with life : portrait of an African American sitting and smiling (Box 72) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/491fj6q597-cor.
Chicago
Eckstone, C. “Satisfied with Life : Portrait of an African American Sitting and Smiling.” 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/491fj6q597-cor.