MLA
Montfort, Theodorick W. Letter from Theodorick W. Montfort (Fort Pulaski, Georgia) to "Dear Ma." Montfort, from Macon County, Georgia, Served in the 25th Georgia Infantry Regiment - April 5, 1862 (Typescript). 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 5, Folder 26. https://digital.library.emory.edu/purl/252j6q584q-cor.
APA, 6th edition
Montfort, T. W. (1862). Letter from Theodorick W. Montfort (Fort Pulaski, Georgia) to "Dear Ma." Montfort, from Macon County, Georgia, served in the 25th Georgia Infantry Regiment - April 5, 1862 (typescript) (Box 5, Folder 26) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/252j6q584q-cor.
Chicago
Montfort, Theodorick W. “Letter from Theodorick W. Montfort (Fort Pulaski, Georgia) to ‘Dear Ma." Montfort, from Macon County, Georgia, Served in the 25th Georgia Infantry Regiment - April 5, 1862 (Typescript).” Letters (correspondence). Civil War Collection, 1862. Box 5, Folder 26. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/252j6q584q-cor.