MLA
Bell, Bess. Letter from Bess Bell (Bascom, Georgia) to "Miss Kate" [Enecks] (Egypt, Georgia) Which Describes the Formation of the Bascom Home Guards, a "Female Company" - May 10, 1861. 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 3, Folder 20. https://digital.library.emory.edu/purl/6214mw6n96-cor.
APA, 6th edition
Bell, B. (1861). Letter from Bess Bell (Bascom, Georgia) to "Miss Kate" [Enecks] (Egypt, Georgia) which describes the formation of the Bascom Home Guards, a "Female Company" - May 10, 1861 (Box 3, Folder 20) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6214mw6n96-cor.
Chicago
Bell, Bess. “Letter from Bess Bell (Bascom, Georgia) to ‘Miss Kate’ [Enecks] (Egypt, Georgia) Which Describes the Formation of the Bascom Home Guards, a ‘Female Company’ - May 10, 1861.” Letters (correspondence). Civil War Collection, 1861. Box 3, Folder 20. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6214mw6n96-cor.