MLA
Pollard, Edward Alfred, 1831-1872. The southern spy : letters on the policy and inauguration of the Lincoln war : written anonymously in Washington and elsewhere. 1861. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7956djhf8f-cor.
APA, 6th edition
Pollard, Edward Alfred, 1831-1872. (1861)[The southern spy : letters on the policy and inauguration of the Lincoln war : written anonymously in Washington and elsewhere, [2nd edition].]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7956djhf8f-cor.
Chicago
Pollard, Edward Alfred, 1831-1872, The southern spy : letters on the policy and inauguration of the Lincoln war : written anonymously in Washington and elsewhere, 1861, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7956djhf8f-cor.