MLA
Pollard, Edward A. (Edward Alfred), 1831-1872. The rival administrations : Richmond and Washington in December, 1863. 1864. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0343r22cgk-cor.
APA, 6th edition
Pollard, Edward A. (Edward Alfred), 1831-1872. (1864)[The rival administrations : Richmond and Washington in December, 1863]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0343r22cgk-cor.
Chicago
Pollard, Edward A. (Edward Alfred), 1831-1872, The rival administrations : Richmond and Washington in December, 1863, 1864, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0343r22cgk-cor.