MLA
Krebbs, S. H., and Co. Negro Building : Permanent Buildings of the Appalachian Exposition in Knoxville, Tenn. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/020fttdz3w-cor.
APA, 6th edition
Krebbs, S. H., & C. Negro building : permanent buildings of the Appalachian Exposition in Knoxville, Tenn. (Box 70) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/020fttdz3w-cor.
Chicago
Krebbs, S. H., and Co. “Negro Building : Permanent Buildings of the Appalachian Exposition in Knoxville, Tenn.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/020fttdz3w-cor.