- Author: Leonard Peikoff
- Language: English
- Year: 1983
- Author: Ayn Rand & Harry Binswanger
- Language: English
- Year: 1988
- Author: Ayn Rand, Leonard Peikoff, Peter Schwartz
- Language: English
- Author: Ayn Rand, Leonard Peikoff, Peter Schwartz
- Language: English
- Author: Leonard Peikoff
- Language: English
- Year: 1993