MLA
United States Secretary of the Treasure and Politician William P. Fessenden. 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 22, Folder 15. https://digital.library.emory.edu/purl/904dncjv65-cor.
APA, 6th edition
United States Secretary of the Treasure and politician William P. Fessenden (Box 22, Folder 15). (1861). [Cartes-de-visite (card photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/904dncjv65-cor.
Chicago
“United States Secretary of the Treasure and Politician William P. Fessenden.” Cartes-de-visite (card photographs). Civil War Collection, 1861. Box 22, Folder 15. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/904dncjv65-cor.