[22] User/Agent Modeling

   Rapaport, William J., "Belief Representation Systems", in S. C.
   Shapiro (ed.), Encyclopedia of Artificial Intelligence, 2nd edition
   John Wiley, New York, pages 98-110, 1992.

   Afzal Ballim and Yorick Wilks, "Artifical Believers", Lawrence
   Erlbaum Associates, Hillsdale, NJ, 1991. ISBN 0-8058-0453-6.
   Contains a 92 page background section on belief modeling in AI,
   Philosophy, NLP and Linguistics. 

   Kobsa, A. & Wahlster, W. (1989) "User Models in Dialog Systems."
   Springer-Verlag, Heidelberg.

See also the journal User Modeling and User-Adapted Interaction in 
part 3 of the AI FAQ.