1. Strategic Nonviolent Conflict;Ackerman,1994
2. A Force More Powerful: A Century of Nonviolent Conflict;Ackerman,2000
3. Agence France Presse, 2005. The stealthy role of military informers in Ukraine revolution. February 15.
4. Polyarchy: Participation and Opposition;Dahl,1971
5. Glas Javnosti, October 2, 2000.