MLA
Elliott, Stephen, 1806-1866. "Vain is the help of man" : a sermon preached in Christ Church, Savannah, on Thursday, September 15, 1864, being the day of fasting, humiliation, and prayer, appointed by the governor of the state of Georgia. 1864. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98wnk-cor.
APA, 6th edition
Elliott, Stephen, 1806-1866. (1864)["Vain is the help of man" : a sermon preached in Christ Church, Savannah, on Thursday, September 15, 1864, being the day of fasting, humiliation, and prayer, appointed by the governor of the state of Georgia]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98wnk-cor.
Chicago
Elliott, Stephen, 1806-1866, "Vain is the help of man" : a sermon preached in Christ Church, Savannah, on Thursday, September 15, 1864, being the day of fasting, humiliation, and prayer, appointed by the governor of the state of Georgia, 1864, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98wnk-cor.