MLA
Witt, Allen Rufus. Telegram from Colonel Allen Rufus Witt to Brigadier General Daniel Ruggles - October 6, 1862. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 6. https://digital.library.emory.edu/purl/337vmcvfcc-cor.
APA, 6th edition
Witt, A. R. (1862). Telegram from Colonel Allen Rufus Witt to Brigadier General Daniel Ruggles - October 6, 1862 (Box 6, Folder 6) [Telegrams]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/337vmcvfcc-cor.
Chicago
Witt, Allen Rufus. “Telegram from Colonel Allen Rufus Witt to Brigadier General Daniel Ruggles - October 6, 1862.” Telegrams. Civil War Collection, 1862. Box 6, Folder 6. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/337vmcvfcc-cor.