MLA
Moore, Roger L. Statue of John Brown, American Abolitionist, Standing with an African American Boy. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 69. https://digital.library.emory.edu/purl/286nzs7h6v-cor.
APA, 6th edition
Moore, R. L. Statue of John Brown, American Abolitionist, standing with an African American boy (Box 69) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/286nzs7h6v-cor.
Chicago
Moore, Roger L. “Statue of John Brown, American Abolitionist, Standing with an African American Boy.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 69. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/286nzs7h6v-cor.