MLA
Fall, Phillip H. Letter from Phillip H. Fall (Houston, Texas) to General William E. Mickle, Regarding His Part in Preventing Vicksburg from Being Captured in 1862 - January 6, 1905. 1905. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 8, Folder 25. https://digital.library.emory.edu/purl/3483j9kdtt-cor.
APA, 6th edition
Fall, P. H. (1905). Letter from Phillip H. Fall (Houston, Texas) to General William E. Mickle, regarding his part in preventing Vicksburg from being captured in 1862 - January 6, 1905 (Box 8, Folder 25) [Letters (correspondence)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3483j9kdtt-cor.
Chicago
Fall, Phillip H. “Letter from Phillip H. Fall (Houston, Texas) to General William E. Mickle, Regarding His Part in Preventing Vicksburg from Being Captured in 1862 - January 6, 1905.” Letters (correspondence). Civil War Collection, 1905. Box 8, Folder 25. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3483j9kdtt-cor.