MLA
Smyth, Thomas, 1808-1873. The battle of Fort Sumter : its mystery and miracle, God's mastery and mercy : a discourse preached on the day of national fasting, thanksgiving and prayer, in the First Presbyterian Church, Charleston, S.C., June 13, 1861. 1861. Civil War Imprints. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98wv3-cor.
APA, 6th edition
Smyth, Thomas, 1808-1873. (1861)[The battle of Fort Sumter : its mystery and miracle, God's mastery and mercy : a discourse preached on the day of national fasting, thanksgiving and prayer, in the First Presbyterian Church, Charleston, S.C., June 13, 1861]. Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98wv3-cor.
Chicago
Smyth, Thomas, 1808-1873, The battle of Fort Sumter : its mystery and miracle, God's mastery and mercy : a discourse preached on the day of national fasting, thanksgiving and prayer, in the First Presbyterian Church, Charleston, S.C., June 13, 1861, 1861, Civil War Imprints, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98wv3-cor.