MLA
West, Andrew Jackson. Letter from Andrew Jackson West (Atlanta, Georgia) to General William E. Mickle, Thanking Him for a Report - March 28, 1904. 1904. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 9, Folder 45. https://digital.library.emory.edu/purl/8708w9gk1d-cor.
APA, 6th edition
West, A. J. (1904). Letter from Andrew Jackson West (Atlanta, Georgia) to General William E. Mickle, thanking him for a report - March 28, 1904 (Box 9, Folder 45) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8708w9gk1d-cor.
Chicago
West, Andrew Jackson. “Letter from Andrew Jackson West (Atlanta, Georgia) to General William E. Mickle, Thanking Him for a Report - March 28, 1904.” Letters (correspondence). Civil War Collection, 1904. Box 9, Folder 45. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8708w9gk1d-cor.