1. Bacharach, M., and D. Gambetta. 2001. Trust as type detection. In Trust and deception in virtual societies, ed. C. Castelfranchi and Y.-H. Tan. Dordrecht/Boston: Kluwer Academic.
2. Castelfranchi, C., and R. Falcone. 2001. Social trust: A cognitive approach. In Trust and deception in virtual societies, ed. C. Castelfranchi and Y.-H. Tan. Dordrecht/Boston: Kluwer Academic.
3. Castelfranchi, C., and R. Falcone. 2010. Trust theory: A socio-cognitive and computational model. Chichester: Wiley.
4. Chellas, B.F. 1988. Modal logic: An introduction. Cambrige: Cambridge University Press.
5. Demolombe, R. 2001. To trust information sources: A proposal for a modal logical framework. In Trust and deception in virtual societies, ed. C. Castelfranchi and Y.-H. Tan. Dordrecht/Boston: Kluwer Academic.