MLA
Confederate General Robert Edward Lee. Lee Gallery, 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 16, Folder 45. https://digital.library.emory.edu/purl/136h1893s0-cor.
APA, 6th edition
Confederate general Robert Edward Lee (Box 16, Folder 45). (1864). [Cartes-de-visite (card photographs)]. Lee Gallery; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/136h1893s0-cor.
Chicago
“Confederate General Robert Edward Lee.” Cartes-de-visite (card photographs). Civil War Collection. Richmond, VA: Lee Gallery, 1864. Box 16, Folder 45. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/136h1893s0-cor.