MLA
Showes, Sandford. 25th Anniversary Tuskegee Normal and Industrial Institute, April 4-5-6, 1906. 1906. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/709w0vt4gp-cor.
APA, 6th edition
Showes, S. (1906). 25th anniversary Tuskegee Normal and Industrial Institute, April 4-5-6, 1906 (Box 71) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/709w0vt4gp-cor.
Chicago
Showes, Sandford. “25th Anniversary Tuskegee Normal and Industrial Institute, April 4-5-6, 1906.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1906. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/709w0vt4gp-cor.