MLA
Steward, Charles G. Business Card, Dr. Charles G. Steward, Dentist. 1848. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 6. https://digital.library.emory.edu/purl/156zw3r3jj-cor.
APA, 6th edition
Steward, C. G. (1848). Business card, Dr. Charles G. Steward, dentist (Box 1, Folder 6) [Business cards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/156zw3r3jj-cor.
Chicago
Steward, Charles G. “Business Card, Dr. Charles G. Steward, Dentist.” Business cards. William H. Scott Family Papers, 1848-1982, 1848. Box 1, Folder 6. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/156zw3r3jj-cor.