MLA
The Confederate States Almanac for the Year of Our Lord 1862 : Being the Second after Bissextile, or Leap Year, the Eighty-Sixth of American Independence, and the Second of the Confederate States : Calculations Made at the University of Alabama. Southern Methodist Pub. House, 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/419s1rnd0g-cor.
APA, 6th edition
The Confederate States almanac for the year of our Lord 1862 : being the second after bissextile, or leap year, the eighty-sixth of American independence, and the second of the Confederate States : calculations made at the University of Alabama. (1862). [Almanacs, Southern imprint]. Southern Methodist Pub. House; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/419s1rnd0g-cor.
Chicago
“The Confederate States Almanac for the Year of Our Lord 1862 : Being the Second after Bissextile, or Leap Year, the Eighty-Sixth of American Independence, and the Second of the Confederate States : Calculations Made at the University of Alabama.” Almanacs, Southern imprint. Civil War Imprints. Nashville, Tenn.: Southern Methodist Pub. House, 1862. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/419s1rnd0g-cor.