1. Tortas, Abe. 1968.Concerning Dissent and Civil Disobedience, 25New York: New American Library Signet.
2. Sharp, Gene. 1973.The Politics of Nonviolent Action, 117–445. Boston: Porter Sargent.
3. Powlowska, Ija L. January 30 1970. “The Fundamental Principles of Gandhi's Public Activity,” paper Relevance of Gandhi to our Time,”. January 30, 3New Delhi, India