MLA
Cobb, Wm. H., and Co. Two So. Carolina Products, a County Dispensary and Yoked Oxen as Motive Power. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 75. https://digital.library.emory.edu/purl/156zw3r247-cor.
APA, 6th edition
Cobb, W. H., & C. Two So. Carolina products, a county dispensary and yoked oxen as motive power (Box 75) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/156zw3r247-cor.
Chicago
Cobb, Wm. H., and Co. “Two So. Carolina Products, a County Dispensary and Yoked Oxen as Motive Power.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 75. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/156zw3r247-cor.