MLA
Manley, John Washington Jeremiah. Letter from Joseph W. Manley (Camp near Dalton, Georgia) to His Sister (Franklin County, Georgia). Manley Served in Company H of the 34th Georgia Infantry Regiment - May 6, 1864. 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 4, Folder 57. https://digital.library.emory.edu/purl/0687h44k0q-cor.
APA, 6th edition
Manley, J. W. J. (1864). Letter from Joseph W. Manley (Camp near Dalton, Georgia) to his sister (Franklin County, Georgia). Manley served in Company H of the 34th Georgia Infantry Regiment - May 6, 1864 (Box 4, Folder 57) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0687h44k0q-cor.
Chicago
Manley, John Washington Jeremiah. “Letter from Joseph W. Manley (Camp near Dalton, Georgia) to His Sister (Franklin County, Georgia). Manley Served in Company H of the 34th Georgia Infantry Regiment - May 6, 1864.” Letters (correspondence). Civil War Collection, 1864. Box 4, Folder 57. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0687h44k0q-cor.