- Niven, Penelope. Carl Sandburg: A Biography. New York: Scribner's, 1991.
- Sandburg, Carl. The Letters of Carl Sandburg. New York: Harcourt, Brace & World, 1968.
- Sandburg, Helga. A Great and Glorious Romance: The Story of Carl Sandburg and Lilian Steichen. New York: Harcourt Brace Jovanovich, 1978.
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