MLA
Stephens, Alexander H. (Alexander Hamilton), 1812-1883. The great speech of Hon. A.H. Stephens : delivered before the Georgia Legislature, on Wednesday night, March 16th, 1864 : to which is added extracts prom [sic] Gov. Brown's message to the Georgia Legislature.. 1864. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/880ht76mpk-cor.
APA, 6th edition
Stephens, Alexander H. (Alexander Hamilton), 1812-1883. (1864)[The great speech of Hon. A.H. Stephens : delivered before the Georgia Legislature, on Wednesday night, March 16th, 1864 : to which is added extracts prom [sic] Gov. Brown's message to the Georgia Legislature.]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/880ht76mpk-cor.
Chicago
Stephens, Alexander H. (Alexander Hamilton), 1812-1883, The great speech of Hon. A.H. Stephens : delivered before the Georgia Legislature, on Wednesday night, March 16th, 1864 : to which is added extracts prom [sic] Gov. Brown's message to the Georgia Legislature., 1864, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/880ht76mpk-cor.