MLA
Berry, Peggy Mira, 1799-1874. Letter from Peggy Mira Berry (McDonough, Georgia) to her children - December 12, 1864 (typescript). December 14, 1864. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/95269p8f0s-cor.
APA, 6th edition
Berry, Peggy Mira, 1799-1874. (December 14, 1864)[Letter from Peggy Mira Berry (McDonough, Georgia) to her children - December 12, 1864 (typescript)]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/95269p8f0s-cor.
Chicago
Berry, Peggy Mira, 1799-1874, Letter from Peggy Mira Berry (McDonough, Georgia) to her children - December 12, 1864 (typescript), December 14, 1864, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/95269p8f0s-cor.