MLA
Hill, D. H. (Daniel Harvey), 1821-1889. Letter from Daniel Harvey Hill (Milledgeville, Georgia) to James Longstreet - June 7, 1886 (typescript). June 7, 1886. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/535t76hfsh-cor.
APA, 6th edition
Hill, D. H. (Daniel Harvey), 1821-1889. (June 7, 1886)[Letter from Daniel Harvey Hill (Milledgeville, Georgia) to James Longstreet - June 7, 1886 (typescript)]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/535t76hfsh-cor.
Chicago
Hill, D. H. (Daniel Harvey), 1821-1889, Letter from Daniel Harvey Hill (Milledgeville, Georgia) to James Longstreet - June 7, 1886 (typescript), June 7, 1886, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/535t76hfsh-cor.