MLA
Galleries, Brady's National Photographic Portrait. President of the Confederate States Jefferson Davis. E. and H. T. Anthony, 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 16, Folder 20. https://digital.library.emory.edu/purl/470zpc86zr-cor.
APA, 6th edition
Galleries, B. N. P. P. (1861). President of the Confederate States Jefferson Davis (Box 16, Folder 20) [Cartes-de-visite (card photographs)]. E. and H. T. Anthony; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/470zpc86zr-cor.
Chicago
Galleries, Brady's National Photographic Portrait. “President of the Confederate States Jefferson Davis.” Cartes-de-visite (card photographs). Civil War Collection. New York City, NY: E. and H. T. Anthony, 1861. Box 16, Folder 20. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/470zpc86zr-cor.