MLA
Sanlle, A. Telegram from A. Sanlle to Brigadier General Daniel Ruggles - April 20, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 6. https://digital.library.emory.edu/purl/27312jm6ss-cor.
APA, 6th edition
Sanlle, A. (1863). Telegram from A. Sanlle to Brigadier General Daniel Ruggles - April 20, 1863 (Box 6, Folder 6) [Telegrams]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/27312jm6ss-cor.
Chicago
Sanlle, A. “Telegram from A. Sanlle to Brigadier General Daniel Ruggles - April 20, 1863.” Telegrams. Civil War Collection, 1863. Box 6, Folder 6. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/27312jm6ss-cor.