MLA
Ivy, John H. Letter from John H. Ivy (Atlanta, Georgia) to "Friend Dagg." Ivy, a 2nd Lieutenant, Served in Company G of the 38th Tennessee Infantry Regiment - August 10, 1864. 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 4, Folder 1. https://digital.library.emory.edu/purl/610wpzgnvp-cor.
APA, 6th edition
Ivy, J. H. (1864). Letter from John H. Ivy (Atlanta, Georgia) to "Friend Dagg." Ivy, a 2nd Lieutenant, served in Company G of the 38th Tennessee Infantry Regiment - August 10, 1864 (Box 4, Folder 1) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/610wpzgnvp-cor.
Chicago
Ivy, John H. “Letter from John H. Ivy (Atlanta, Georgia) to ‘Friend Dagg." Ivy, a 2nd Lieutenant, Served in Company G of the 38th Tennessee Infantry Regiment - August 10, 1864.” Letters (correspondence). Civil War Collection, 1864. Box 4, Folder 1. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/610wpzgnvp-cor.