MLA
Nihoof, D. F. Letter from D. F. Nihoof (Dublin Depot, Virginia) to "Friend Bob" - February 18, 1865. 1865. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 5, Folder 39. https://digital.library.emory.edu/purl/1439zw3s5h-cor.
APA, 6th edition
Nihoof, D. F. (1865). Letter from D. F. Nihoof (Dublin Depot, Virginia) to "Friend Bob" - February 18, 1865 (Box 5, Folder 39) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1439zw3s5h-cor.
Chicago
Nihoof, D. F. “Letter from D. F. Nihoof (Dublin Depot, Virginia) to ‘Friend Bob’ - February 18, 1865.” Letters (correspondence). Civil War Collection, 1865. Box 5, Folder 39. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1439zw3s5h-cor.