MLA
Pasour, E. G. Old Fancy, Confederate General Thomas" Stonewall "Jackson's Horse. Photograph Taken at Cansler's Store in Gaston County, North Carolina on May 25, 1880. Pasour, E. G., 1880. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 17, Folder 7. https://digital.library.emory.edu/purl/849t1g1m19-cor.
APA, 6th edition
Pasour, E. G. (1880). Old Fancy, Confederate general Thomas" Stonewall "Jackson's horse. Photograph taken at Cansler's Store in Gaston County, North Carolina on May 25, 1880 (Box 17, Folder 7) [Cartes-de-visite (card photographs)]. Pasour, E. G.; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/849t1g1m19-cor.
Chicago
Pasour, E. G. “Old Fancy, Confederate General Thomas’ Stonewall ‘Jackson's Horse. Photograph Taken at Cansler's Store in Gaston County, North Carolina on May 25, 1880.” Cartes-de-visite (card photographs). Civil War Collection. Dallas, N. C.: Pasour, E. G., 1880. Box 17, Folder 7. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/849t1g1m19-cor.