1. R. Axelrod. The Evolution of Cooperation. Basic Books, Inc., Publishers, New York, USA., 1984.
2. B. Crabtree and N. (eds.). The Practical Application of Intelligent Agents and Multi-Agent Technology. London, UK., 1996.
3. D. G.Pruitt. Negotiation Behavior. Academic Press. 1981.
4. A. Ito and H. Yano. The emergence of cooperation in a society of autonomous agents — the prisoner's dilemma gamme under the disclosure of contract histories. In V. Lesser, editor, Proceedings of the First International Conference on Multi-Agent Systems, pages 201–208, San Francisco, USA, 1995. AAAI Press/The MIT Press.
5. N. R. Jennings, P. Faratin, M. J. Johnson, T. J. Norman, P. O'Brien, and M. E. Wiegand. Agent-based business process management. Int Journal of Cooperative Information Systems, 5(2–3): 105–130, 1996.