Causes
  • Craven, Avery Odelle, 1886- The coming of the Civil War. [Chicago] University of Chicago Press [1957] Includes bibliography.
  • Owen, Robert Dale, 1801-1877. The future of the North-west: in connection with the scheme of reconstruction without New England. By Robert Dale Owen. Philadelphia, [Crissy & Markley, printer] 1863.
  • Potter, David Morris. The impending crisis, 1848-1861 / by David M. Potter ; completed and edited by Don E. Fehrenbacher. New York : Harper & Row, c1976. Includes bibliography and index.