MLA
Smith, Henry Wright, 1828-. Union general William Rosecrans. 1861?/1880?. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/651vdncm03-cor.
APA, 6th edition
Smith, Henry Wright, 1828-. (1861?/1880?)[Union general William Rosecrans]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/651vdncm03-cor.
Chicago
Smith, Henry Wright, 1828-, Union general William Rosecrans, 1861?/1880?, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/651vdncm03-cor.