MLA
Photographers, Phillips'. Confederate General John Byron Gordon. Phillips' Photographers, 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 16, Folder 27. https://digital.library.emory.edu/purl/726xwdbsmh-cor.
APA, 6th edition
Photographers, P. (1861). Confederate general John Byron Gordon (Box 16, Folder 27) [Cartes-de-visite (card photographs)]. Phillips' Photographers; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/726xwdbsmh-cor.
Chicago
Photographers, Phillips'. “Confederate General John Byron Gordon.” Cartes-de-visite (card photographs). Civil War Collection. Philadelphia, PA: Phillips' Photographers, 1861. Box 16, Folder 27. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/726xwdbsmh-cor.