MLA
Reynolds, Isaac Vermillion. Letter from Isaac Vermillion Reynolds (Rockingham County, Virginia) to His Wife. Reynolds Served in Company A of the 16th Virginia Cavalry Regiment - July 30, 1863 (Typescript). 1863. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 5, Folder 59. https://digital.library.emory.edu/purl/337vmcvfrs-cor.
APA, 6th edition
Reynolds, I. V. (1863). Letter from Isaac Vermillion Reynolds (Rockingham County, Virginia) to his wife. Reynolds served in Company A of the 16th Virginia Cavalry Regiment - July 30, 1863 (typescript) (Box 5, Folder 59) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/337vmcvfrs-cor.
Chicago
Reynolds, Isaac Vermillion. “Letter from Isaac Vermillion Reynolds (Rockingham County, Virginia) to His Wife. Reynolds Served in Company A of the 16th Virginia Cavalry Regiment - July 30, 1863 (Typescript).” Letters (correspondence). Civil War Collection, 1863. Box 5, Folder 59. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/337vmcvfrs-cor.