MLA
Pass Signed by Drake De Kay and Issued to Captain Thorn (Washington, D. C.). 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 19, Folder 19. https://digital.library.emory.edu/purl/880ht76jkc-cor.
APA, 6th edition
Pass signed by Drake De Kay and issued to Captain Thorn (Washington, D. C.) (Box 19, Folder 19). (1861). [Military passes]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/880ht76jkc-cor.
Chicago
“Pass Signed by Drake De Kay and Issued to Captain Thorn (Washington, D. C.).” Military passes. Civil War Collection, 1861. Box 19, Folder 19. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/880ht76jkc-cor.