- Author: Konrad lorenz
- Language: Spanish
- Year: 2011
- Author: Konrad Lorenz
- Language: Spanish
- Year: 1963
- Author: Konrad Lorenz
- Language: Spanish
- Year: 1973
- Author: Konrad Lorenz
- Language: Spanish
- Year: 1949
- Author: Karl R. Popper & Konrad Lorenz
- Language: Spanish
- Year: 1985
- Author: Konrad Lorenz
- Language: Italian
- Year: 1989
- Author: Konrad Lorenz
- Language: Spanish
- Year: 1985
- Author: Konrad Lorenz
- Language: Spanish
- Year: 1949
- Author: Konrad Lorenz
- Language: Spanish
- Year: 1963
- Author: Konrad Lorenz
- Language: Italian
- Year: 2015