MLA
Woody, Green B. Letter by Green B. Woody to His Sons. Woody Served in Company C of the 58th North Carolina Infantry Regiment. 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 7, Folder 41. https://digital.library.emory.edu/purl/3311ns1smh-cor.
APA, 6th edition
Woody, G. B. (1862). Letter by Green B. Woody to his sons. Woody served in Company C of the 58th North Carolina Infantry Regiment (Box 7, Folder 41) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3311ns1smh-cor.
Chicago
Woody, Green B. “Letter by Green B. Woody to His Sons. Woody Served in Company C of the 58th North Carolina Infantry Regiment.” Letters (correspondence). Civil War Collection, 1862. Box 7, Folder 41. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3311ns1smh-cor.