MLA
Krebbs, S. H., and Co. Loading Compressed Bales of Cotton into the Hold of a Vessel for Export, Pensacola, Fla. : African American Men Loading Cotton Bales onto a Ship Using a Crane, in Pensacola, Florida. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/122v41ns4b-cor.
APA, 6th edition
Krebbs, S. H., & C. Loading compressed bales of cotton into the hold of a vessel for export, Pensacola, Fla. : African American men loading cotton bales onto a ship using a crane, in Pensacola, Florida (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/122v41ns4b-cor.
Chicago
Krebbs, S. H., and Co. “Loading Compressed Bales of Cotton into the Hold of a Vessel for Export, Pensacola, Fla. : African American Men Loading Cotton Bales onto a Ship Using a Crane, in Pensacola, Florida.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/122v41ns4b-cor.