- Author: Tomás Navarro Tomás
- Language: Spanish
- Year: 1972
- Author: Priscilla N. Cohn
- Language: Spanish
- Year: 1975
- Author: Romano Guardini
- Language: Spanish
- Year: 1960
- Author: Hans Freyer
- Language: Spanish
- Year: 1958
- Author: Charles Wilson
- Language: Spanish
- Year: 1968
- Author: Hugh Kearney
- Language: Spanish
- Year: 1970
- Author: Tomás Navarro Tomás
- Language: Spanish
- Year: 1972
- Author: George Uscatescu
- Language: Spanish
- Year: 1959
- Author: George Uscatescu
- Language: Spanish
- Year: 1963
- Author: Martín Alonso
- Language: Spanish
- Year: 1974