MLA
Krebbs, S. H., and Co. Cotton on the Ship Channel, Houston, Texas : Shipments Amount to Nearly 400,000 Bales per Year [Hand Colored]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/2085hqbzq5-cor.
APA, 6th edition
Krebbs, S. H., & C. Cotton on the ship channel, Houston, Texas : shipments amount to nearly 400,000 bales per year [hand colored] (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/2085hqbzq5-cor.
Chicago
Krebbs, S. H., and Co. “Cotton on the Ship Channel, Houston, Texas : Shipments Amount to Nearly 400,000 Bales per Year [Hand Colored].” 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/2085hqbzq5-cor.