MLA
Hickey, Andrew. Letter from Andrew Hickey (Camp near Jackson, Tennessee) to His Father. Hickey Was a Lieutenant in the 3rd Michigan Cavalry, Company I - January 19, 1863 (Typescript). 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 19, Folder 34. https://digital.library.emory.edu/purl/7032280hg4-cor.
APA, 6th edition
Hickey, A. (1863). Letter from Andrew Hickey (Camp near Jackson, Tennessee) to his father. Hickey was a Lieutenant in the 3rd Michigan Cavalry, Company I - January 19, 1863 (typescript) (Box 19, Folder 34) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7032280hg4-cor.
Chicago
Hickey, Andrew. “Letter from Andrew Hickey (Camp near Jackson, Tennessee) to His Father. Hickey Was a Lieutenant in the 3rd Michigan Cavalry, Company I - January 19, 1863 (Typescript).” Letters (correspondence). Civil War Collection, 1863. Box 19, Folder 34. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7032280hg4-cor.