1. Azar, E. (1990). The Management of Protracted Social Conflict. Dartmouth: Dartmouth Publishing Company.
2. Berman, M., & Johnson, J. (1977). Unofficial Diplomats. New York: Columbia University Press.
3. Boudreau, T. E. (1984). The Secretary General and Satellite Diplomacy: An Analysis of the Present and Potential Role of the United Nations Secretary-General in the Maintenance of International Peace and Security. New York: Council on Religion and International Affairs.
4. Buzan, B. (1991). New Patterns of Global Security in the Twenty-First Century. International Affairs, 67(3), 431–451.
5. Celente, G. (1991). Trend Tracking. New York: Warner Books.