MLA
Galleries, Brady's National Photographic Portrait. Confederate General and Politician Howell Cobb. E. and H. T. Anthony, 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 16, Folder 15. https://digital.library.emory.edu/purl/4881jwsvcj-cor.
APA, 6th edition
Galleries, B. N. P. P. (1861). Confederate general and politician Howell Cobb (Box 16, Folder 15) [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/4881jwsvcj-cor.
Chicago
Galleries, Brady's National Photographic Portrait. “Confederate General and Politician Howell Cobb.” Cartes-de-visite (card photographs). Civil War Collection. New York City, NY: E. and H. T. Anthony, 1861. Box 16, Folder 15. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4881jwsvcj-cor.