1. Randall, J. G. 1945.Lincoln the President, Vol. I, 135New York: Dodd, Mead.
2. Jones, Howard Mumford and Leisy, Ernest E., eds. 1945.Major American Writers, 681New York: Harcourt, Brace.
3. Barondess, Benjamin. 1954.Three Lincoln Masterpieces, 3Charleston: Education Foundation of West Virginia.
4. Sandburg, Carl. 1927.The Prairie Years, Vol. II, 200–216. New York: Harcourt, Brace.