MLA
Morris, Robert N. Sea Horse Apartments, Ft. Lauderdale, Fla. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/873pvmcvgm-cor.
APA, 6th edition
Morris, R. N. Sea Horse Apartments, Ft. Lauderdale, Fla. (Box 71) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/873pvmcvgm-cor.
Chicago
Morris, Robert N. “Sea Horse Apartments, Ft. Lauderdale, Fla.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/873pvmcvgm-cor.