MLA
Rowe, J. A. Letter from J. A. Rowe (Camp Kinston, North Carolina) to "Nancy Ann" - June 29, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6, Folder 4. https://digital.library.emory.edu/purl/590dv41pgh-cor.
APA, 6th edition
Rowe, J. A. (1863). Letter from J. A. Rowe (Camp Kinston, North Carolina) to "Nancy Ann" - June 29, 1863 (Box 6, Folder 4) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/590dv41pgh-cor.
Chicago
Rowe, J. A. “Letter from J. A. Rowe (Camp Kinston, North Carolina) to ‘Nancy Ann’ - June 29, 1863.” Letters (correspondence). Civil War Collection, 1863. Box 6, Folder 4. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/590dv41pgh-cor.