MLA
Seat, W. H. The Confederate States of America in Prophecy. Printed for the author, at the Southern Methodist Pub. House, 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/450gthtbnp-cor.
APA, 6th edition
Seat, W. H. (1861). The Confederate States of America in prophecy [Southern imprint]. Printed for the author, at the Southern Methodist Pub. House; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/450gthtbnp-cor.
Chicago
Seat, W. H. “The Confederate States of America in Prophecy.” Southern imprint. Civil War Imprints. Nashville, Tenn.: Printed for the author, at the Southern Methodist Pub. House, 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/450gthtbnp-cor.