MLA
Brandon, William Joseph. Letter from William Joseph Brandon (Camp near Culpepper Court House, Virginia) to "Folks at Home" - June 8, 1863. 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 1, Folder 34. https://digital.library.emory.edu/purl/139x0k6fjs-cor.
APA, 6th edition
Brandon, W. J. (1863). Letter from William Joseph Brandon (camp near Culpepper Court House, Virginia) to "Folks at Home" - June 8, 1863 (Box 1, Folder 34) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/139x0k6fjs-cor.
Chicago
Brandon, William Joseph. “Letter from William Joseph Brandon (Camp near Culpepper Court House, Virginia) to ‘Folks at Home’ - June 8, 1863.” Letters (correspondence). Civil War Collection, 1863. Box 1, Folder 34. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/139x0k6fjs-cor.