MLA
Le Gal, Eugene. The School of the Guides : for the Use of the Army of the Confederate States, with Questions. H.P. Hill & Co|John M. Cooper & Co., 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/549g4f4v95-cor.
APA, 6th edition
Le Gal, E. (1861). The school of the guides : for the use of the Army of the Confederate States, with questions. [Southern imprint]. H.P. Hill & Co|John M. Cooper & Co.; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/549g4f4v95-cor.
Chicago
Le Gal, Eugene. “The School of the Guides : for the Use of the Army of the Confederate States, with Questions.” Southern imprint. Civil War Imprints. Griffin, Ga.|Griffin, Geo|Savannah, Geo: H.P. Hill & Co|John M. Cooper & Co., 1861. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/549g4f4v95-cor.