Modal Logic: An Introduction
by Brian F. Chellas · Brian F. Chellas
A Cambridge textbook developing propositional modal logic systematically: standard and minimal (neighbourhood) models, normal and classical systems, soundness, completeness, decidability and filtration, with many exercises. Readers learn to prove metatheorems for modal systems and follow the technical literature.
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plato.stanford.edu
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The classic 1968 textbook introducing propositional and quantified modal logic, including the systems T, S4 and S5, decision procedures and possible-worlds semantics. Readers learn to construct proofs and assess validity in standard modal systems. Later superseded by the authors' New Introduction.