1. Bateson, P (1988). The biological evolution of cooperation and trust. In D. Gambetta (Ed.), Trust: Making and breaking cooperative relations (pp. 14-30). Basil Blackwell: New York.
2. Trust and suspicion
3. Erikson, E. H. (1950). Childhood and society. New York: Norton.
4. Erikson, E. H. ( 1968). Identity, Youth and Crisis. New York: Norton.
5. Gambetta, D. (1988). Trust: Making and breaking cooperative relations. New York: Basil Blackwell.