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2. Sexual selection;Andersson,1994
3. The biology of aggression;Archer,1988
4. Leadership styles and cultural values among managers and subordinates: A comparative study of four countries of the former Soviet Union, Germany, and the US;Ardichvili;Human Resource Development International,2002
5. Baker, P. (2007, October 11). Head and shoulders above the rest. The Washington Post. Retrieved from http://blog.washingtonpost.com/44/2007/10/11/head_and_shoulders_above.html