MLA
Toombs, Robert Augustus, 1810-1885. Letter from former Georgia Senator and former Confederate Secretary of State, Robert Augustus Toombs Washington, Georgia), to Colonel Lewis Neale Whittle (Macon, Georgia) regarding political matters - December 16, 1870 (photocopy). December 16, 1870. Civil War Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kpsvj-cor.
APA, 6th edition
Toombs, Robert Augustus, 1810-1885. (December 16, 1870)[Letter from former Georgia Senator and former Confederate Secretary of State, Robert Augustus Toombs Washington, Georgia), to Colonel Lewis Neale Whittle (Macon, Georgia) regarding political matters - December 16, 1870 (photocopy)]. Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kpsvj-cor.
Chicago
Toombs, Robert Augustus, 1810-1885, Letter from former Georgia Senator and former Confederate Secretary of State, Robert Augustus Toombs Washington, Georgia), to Colonel Lewis Neale Whittle (Macon, Georgia) regarding political matters - December 16, 1870 (photocopy), December 16, 1870, Civil War Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52908kpsvj-cor.