MLA
Pearl, Dyer. Letter from Dyer Pearl (Nashville, Tennessee) to W. B. Tinsley (Savannah, Georgia) Regarding the Confiscation Act of 1861 - October 24, 1861. 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 5, Folder 42. https://digital.library.emory.edu/purl/146qz613kw-cor.
APA, 6th edition
Pearl, D. (1861). Letter from Dyer Pearl (Nashville, Tennessee) to W. B. Tinsley (Savannah, Georgia) regarding the Confiscation Act of 1861 - October 24, 1861 (Box 5, Folder 42) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/146qz613kw-cor.
Chicago
Pearl, Dyer. “Letter from Dyer Pearl (Nashville, Tennessee) to W. B. Tinsley (Savannah, Georgia) Regarding the Confiscation Act of 1861 - October 24, 1861.” Letters (correspondence). Civil War Collection, 1861. Box 5, Folder 42. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/146qz613kw-cor.