MLA
Circular. [publisher not identified], 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/39995x6dv6-cor.
APA, 6th edition
Circular. (1864). [Southern imprint]. [publisher not identified]; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/39995x6dv6-cor.
Chicago
“Circular.” Southern imprint. Civil War Imprints. [Richmond, Va.]: [publisher not identified], 1864. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/39995x6dv6-cor.