MLA
Smith, Robert A. Letter by Robert A. Smith to Captain George M. Hanvey; Hanvey Served in the 1st Georgia Infantry Regiment (Ramsey's); Later Company A of the 12th Battalion Georgia Light Artillery - January 1, 1859 (Photocopy). 1859. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 3, Folder. https://digital.library.emory.edu/purl/5805x69q96-cor.
APA, 6th edition
Smith, R. A. (1859). Letter by Robert A. Smith to Captain George M. Hanvey; Hanvey served in the 1st Georgia Infantry Regiment (Ramsey's); later Company A of the 12th Battalion Georgia Light Artillery - January 1, 1859 (photocopy) (Box 3, Folder) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/5805x69q96-cor.
Chicago
Smith, Robert A. “Letter by Robert A. Smith to Captain George M. Hanvey; Hanvey Served in the 1st Georgia Infantry Regiment (Ramsey's); Later Company A of the 12th Battalion Georgia Light Artillery - January 1, 1859 (Photocopy).” Letters (correspondence). Civil War Collection, 1859. Box 3, Folder. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/5805x69q96-cor.