MLA
Confederate Politician and Diplomat John Slidell. 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 17, Folder 18. https://digital.library.emory.edu/purl/948sbcc3m5-cor.
APA, 6th edition
Confederate politician and diplomat John Slidell (Box 17, Folder 18). (1861). [Cartes-de-visite (card photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/948sbcc3m5-cor.
Chicago
“Confederate Politician and Diplomat John Slidell.” Cartes-de-visite (card photographs). Civil War Collection, 1861. Box 17, Folder 18. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/948sbcc3m5-cor.