MLA
Clell. Robert R. Moton High School : the Leading Colored High School in Arkansas, Erected in 1927. 1927. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 69. https://digital.library.emory.edu/purl/965v6wwq36-cor.
APA, 6th edition
C. (1927). Robert R. Moton High School : the leading colored high school in Arkansas, erected in 1927 (Box 69) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/965v6wwq36-cor.
Chicago
Clell. “Robert R. Moton High School : the Leading Colored High School in Arkansas, Erected in 1927.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1927. Box 69. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/965v6wwq36-cor.