TITLE: Literature on Kripke models
QUESTION [5 upvotes]: Which is the best introduction to Kripke-models for modal logics?
I am a M.Sc in mathematics and know predicatlogic.

REPLY [3 votes]: Brian F. Chellas: Modal Logic: An Introduction, 1980.
Starts very basic but covers in detail the beautiful completeness theorem proofs for the basic systems like $S5$, $S4$, $K$.