MLA
Hill, Benjamin H. (Benjamin Harvey), 1823-1882. Letter from Benjamin Harvey Hill to W. J. Park - January 22, 1867 (photocopy). January 22, 1867. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/276f1vhjn0-cor.
APA, 6th edition
Hill, Benjamin H. (Benjamin Harvey), 1823-1882. (January 22, 1867)[Letter from Benjamin Harvey Hill to W. J. Park - January 22, 1867 (photocopy)]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/276f1vhjn0-cor.
Chicago
Hill, Benjamin H. (Benjamin Harvey), 1823-1882, Letter from Benjamin Harvey Hill to W. J. Park - January 22, 1867 (photocopy), January 22, 1867, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/276f1vhjn0-cor.