MLA
Manley, John Washington Jeremiah. Letter from Joseph W. Manley to His Sister (Franklin County, Georgia). Manley Served in Company H of the 34th Georgia Infantry Regiment. 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 4, Folder 57. https://digital.library.emory.edu/purl/0859cnp6k4-cor.
APA, 6th edition
Manley, J. W. J. (1861). Letter from Joseph W. Manley to his sister (Franklin County, Georgia). Manley served in Company H of the 34th Georgia Infantry Regiment (Box 4, Folder 57) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0859cnp6k4-cor.
Chicago
Manley, John Washington Jeremiah. “Letter from Joseph W. Manley to His Sister (Franklin County, Georgia). Manley Served in Company H of the 34th Georgia Infantry Regiment.” Letters (correspondence). Civil War Collection, 1861. Box 4, Folder 57. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0859cnp6k4-cor.