MLA
De Fontaine, F. G. (Felix Gregory), 1832-1896. Marginalia, or, Gleanings from an army note-book. 1864. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/549g4f4twz-cor.
APA, 6th edition
De Fontaine, F. G. (Felix Gregory), 1832-1896. (1864)[Marginalia, or, Gleanings from an army note-book]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/549g4f4twz-cor.
Chicago
De Fontaine, F. G. (Felix Gregory), 1832-1896, Marginalia, or, Gleanings from an army note-book, 1864, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/549g4f4twz-cor.