MLA
Horbelt, John E. Letter from John E. Horbelt (Fort Marshall, Baltimore, Maryland) to His Wife. Horbelt Served in the Company C of the 5th New York Infantry Regiment - June 26, 1863 (Typescript). 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 19, Folder 38. https://digital.library.emory.edu/purl/6623bk3kff-cor.
APA, 6th edition
Horbelt, J. E. (1863). Letter from John E. Horbelt (Fort Marshall, Baltimore, Maryland) to his wife. Horbelt served in the Company C of the 5th New York Infantry Regiment - June 26, 1863 (typescript) (Box 19, Folder 38) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6623bk3kff-cor.
Chicago
Horbelt, John E. “Letter from John E. Horbelt (Fort Marshall, Baltimore, Maryland) to His Wife. Horbelt Served in the Company C of the 5th New York Infantry Regiment - June 26, 1863 (Typescript).” Letters (correspondence). Civil War Collection, 1863. Box 19, Folder 38. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6623bk3kff-cor.