MLA
Jimbo, an African American Cook, Standing in a Field Wearing a Hat, Holding a Bucket and Spoon, in Camp Perry, Ohio. 1913. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/474cnp5htz-cor.
APA, 6th edition
Jimbo, an African American cook, standing in a field wearing a hat, holding a bucket and spoon, in Camp Perry, Ohio (Box 70). (1913). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/474cnp5htz-cor.
Chicago
“Jimbo, an African American Cook, Standing in a Field Wearing a Hat, Holding a Bucket and Spoon, in Camp Perry, Ohio.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1913. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/474cnp5htz-cor.