A good reference is Sven Ove Hansson's A Textbook of Belief Dynamics: Theory Change and Database Updating. Although a bit dated by now, Peter Gвdenfors's Knowledge in Flux: Modeling the Dynamics of Epistemic States is also well worth having a look at. For a quick introduction to belief change basics, have a look at the following two papers:

1. Hirofumi Katsuno and Alberto Mendelzon. Propositional knowledge base revision and minimal change. Artificial Intelligence, 52(3), 263-294, 1991.
2. Adnan Darwiche and Judea Pearl. On the logic of iterated belief revision. Artificial Intelligence, 89(1-2):1-29, January, 1997.