- Author: George Friedman
- Language: Romanian
- Year: 2013
- Author: George Friedman
- Language: Estonian
- Year: 2019
- Author: George Friedman
- Language: Romanian
- Year: 2009
- Author: George Friedman
- Language: Spanish
- Year: 1986
- Author: George Friedman
- Language: English
- Year: 2020
- Author: George Friedman
- Language: English
- Year: 2015
- Author: Axel T. Schreiner H. George Friedman
- Language: English
- Year: 1985
- Author: George Friedman
- Language: English
- Year: 2015
- Author: George Friedman
- Language: English
- Year: 2009