Lang, H. J. (1946). The Wit and Wisdom of Abraham Lincoln as Reflected in His Briefer Letters and Speeches (5. Aufl.). The World Publishing Company.

Lang, H. Jack. The Wit and Wisdom of Abraham Lincoln as Reflected in His Briefer Letters and Speeches. 5. Aufl. Cleveland;New York: The World Publishing Company, 1946.

Lang, H. Jack. The Wit and Wisdom of Abraham Lincoln as Reflected in His Briefer Letters and Speeches. 5. Aufl. The World Publishing Company, 1946.