MLA
Harper, Lucius. Portrait of R.G. Lott and Daughter Ethel Harper. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 11. https://digital.library.emory.edu/purl/938jdfn347-cor.
APA, 6th edition
Harper, L. Portrait of R.G. Lott and daughter Ethel Harper (Box 11) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/938jdfn347-cor.
Chicago
Harper, Lucius. “Portrait of R.G. Lott and Daughter Ethel Harper.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 11. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/938jdfn347-cor.