ISBN 0-19-878076-1==External links==* Political Philosophies and Political Ideologies (PDF); by Charles Blattberg, originally published in "Public Affairs Quarterly" 15, No.
* Политический спектр* Радикальный центр* Экстремизм==External links==* Political Philosophies and Political Ideologies (PDF); by Charles Blattberg, originally published in "Public Affairs Quarterly" 15, No.