MLA
Kane, George P. (George Proctor), 1817 or 1820-1878. To all Marylanders in the Confederate States. 1864. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/576rxwdfx0-cor.
APA, 6th edition
Kane, George P. (George Proctor), 1817 or 1820-1878. (1864)[To all Marylanders in the Confederate States]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/576rxwdfx0-cor.
Chicago
Kane, George P. (George Proctor), 1817 or 1820-1878, To all Marylanders in the Confederate States, 1864, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/576rxwdfx0-cor.