MLA
Galleries, Brady's National Photographic Portrait. Confederate General Leonidas Polk. E. and H. T. Anthony, 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 17, Folder 11. https://digital.library.emory.edu/purl/28380gb6pz-cor.
APA, 6th edition
Galleries, B. N. P. P. (1861). Confederate general Leonidas Polk (Box 17, Folder 11) [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/28380gb6pz-cor.
Chicago
Galleries, Brady's National Photographic Portrait. “Confederate General Leonidas Polk.” Cartes-de-visite (card photographs). Civil War Collection. New York City, NY: E. and H. T. Anthony, 1861. Box 17, Folder 11. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/28380gb6pz-cor.