MLA
Letter from the Noncommissioned Officers and Privates of 4th Michigan Cavalry, Company B to Sergeant Henry S. Boutell - March 5, 1864. 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 19, Folder 8. https://digital.library.emory.edu/purl/836547d91k-cor.
APA, 6th edition
Letter from the noncommissioned officers and privates of 4th Michigan Cavalry, Company B to Sergeant Henry S. Boutell - March 5, 1864 (Box 19, Folder 8). (1864). [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/836547d91k-cor.
Chicago
“Letter from the Noncommissioned Officers and Privates of 4th Michigan Cavalry, Company B to Sergeant Henry S. Boutell - March 5, 1864.” Letters (correspondence). Civil War Collection, 1864. Box 19, Folder 8. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/836547d91k-cor.