MLA
Unidentified Confederate Officer[?]. W. Keith, 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 17, Folder 26. https://digital.library.emory.edu/purl/334fn2z48k-cor.
APA, 6th edition
Unidentified Confederate officer[?] (Box 17, Folder 26). (1861). [Cartes-de-visite (card photographs)]. W. Keith; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/334fn2z48k-cor.
Chicago
“Unidentified Confederate Officer[?].” Cartes-de-visite (card photographs). Civil War Collection. Livepool, England: W. Keith, 1861. Box 17, Folder 26. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/334fn2z48k-cor.