MLA
Gardner, J. African American Men and Women Dancing the Cakewalk next to a Man Playing a Guitar. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/8021c5b00q-cor.
APA, 6th edition
Gardner, J. African American men and women dancing the cakewalk next to a man playing a guitar (Box 70) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8021c5b00q-cor.
Chicago
Gardner, J. “African American Men and Women Dancing the Cakewalk next to a Man Playing a Guitar.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8021c5b00q-cor.