MLA
Gilchrist, Robert C. (Robert Cogdell), 1829-. The duties of a judge advocate, in a trial before a general court-martial : compiled from various works on military law. 1864. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/078gf1vmzw-cor.
APA, 6th edition
Gilchrist, Robert C. (Robert Cogdell), 1829-. (1864)[The duties of a judge advocate, in a trial before a general court-martial : compiled from various works on military law]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/078gf1vmzw-cor.
Chicago
Gilchrist, Robert C. (Robert Cogdell), 1829-, The duties of a judge advocate, in a trial before a general court-martial : compiled from various works on military law, 1864, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/078gf1vmzw-cor.