- Author: Jose Ortega y Gasset, Julian Marias, Evelyn Rugg, Diego Marin
- Language: English
- Year: 1961
- Author: Julian Marias
- Language: English
- Year: 1967
- Author: Julian MARIAS
- Language: Spanish
- Year: 1972
- Author: Julian Marias Stanley Appelbaum Clarence C. Strowbridge
- Language: English
- Year: 1967