MLA
Fredericks, Charles D., and Co. Union Engineer and General James Hewett Ledlie. Charles D. Fredericks & Co, 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 22, Folder 30. https://digital.library.emory.edu/purl/6042rbp106-cor.
APA, 6th edition
Fredericks, C. D., & C. (1861). Union engineer and general James Hewett Ledlie (Box 22, Folder 30) [Cartes-de-visite (card photographs)]. Charles D. Fredericks & Co; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6042rbp106-cor.
Chicago
Fredericks, Charles D., and Co. “Union Engineer and General James Hewett Ledlie.” Cartes-de-visite (card photographs). Civil War Collection. New York City, NY: Charles D. Fredericks & Co, 1861. Box 22, Folder 30. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6042rbp106-cor.