MLA
Keahey, G. H. Letter from G. H. Keahey (Tyners Post Office, Hamilton County, Tennessee) to His Sister, Mary A. Keahey. G. H. Keahey Was in Company F of the 7th Alabama Regiment - November 22, 1861 (Typescript). 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 4, Folder 24. https://digital.library.emory.edu/purl/416c2fr05z-cor.
APA, 6th edition
Keahey, G. H. (1861). Letter from G. H. Keahey (Tyners Post Office, Hamilton County, Tennessee) to his sister, Mary A. Keahey. G. H. Keahey was in Company F of the 7th Alabama Regiment - November 22, 1861 (typescript) (Box 4, Folder 24) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/416c2fr05z-cor.
Chicago
Keahey, G. H. “Letter from G. H. Keahey (Tyners Post Office, Hamilton County, Tennessee) to His Sister, Mary A. Keahey. G. H. Keahey Was in Company F of the 7th Alabama Regiment - November 22, 1861 (Typescript).” Letters (correspondence). Civil War Collection, 1861. Box 4, Folder 24. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/416c2fr05z-cor.