
- Author: Mortimer J. Adler Charles Van Doren
- Language: English
- Year: 1972

- Author: Robert M. Hutchins Mortimer J. Adler Fred Steffen
- Language: English
- Year: 1963

- Author: Robert Edward Brennan Mortimer J. Adler
- Language: English
- Year: 1941
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- Author: Robert M. Hutchins Mortimer J. Adler Fred Steffen
- Language: English
- Year: 1963