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2. Frustration-Aggression Theory
3. Burton, J. (1990) Conflict: Resolution and Prevention. New York: St. Martin’s Press.
4. Burton, J. (1997) Violence Explained: The Sources of Conflict, Violence and Crime and Their Prevention. Manchester: Manchester University Press.
5. Cashman, G. (2014) What causes war? New York: Rowman & Littlefield.