MLA
Valentine, and Sons. Negro Vegetable Vendor, Charleston, S.C. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/368kd51c96-cor.
APA, 6th edition
V., & S. Negro vegetable vendor, Charleston, S.C. (Box 71) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/368kd51c96-cor.
Chicago
Valentine, and Sons. “Negro Vegetable Vendor, Charleston, S.C.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/368kd51c96-cor.