MLA
Webster, Noah, 1758-1843. The elementary spelling book : being an improvement on "The American spelling book". 1865. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/187pnvx45w-cor.
APA, 6th edition
Webster, Noah, 1758-1843. (1865)[The elementary spelling book : being an improvement on "The American spelling book", Third Southern edition.]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/187pnvx45w-cor.
Chicago
Webster, Noah, 1758-1843, The elementary spelling book : being an improvement on "The American spelling book", 1865, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/187pnvx45w-cor.