MLA
Hewitt, John Hill, 1801-1890. War : a poem, with copious notes, founded on the revolution of 1861-62, (up to the battles before Richmond, inclusive). 1862. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3483j9khbq-cor.
APA, 6th edition
Hewitt, John Hill, 1801-1890. (1862)[War : a poem, with copious notes, founded on the revolution of 1861-62, (up to the battles before Richmond, inclusive)]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3483j9khbq-cor.
Chicago
Hewitt, John Hill, 1801-1890, War : a poem, with copious notes, founded on the revolution of 1861-62, (up to the battles before Richmond, inclusive), 1862, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3483j9khbq-cor.