APA (7th ed.) Citation

Chellas, B. F. (1988). Modal logic: An introduction (repr.). Cambridge Univ. Pr.

Chicago Style (17th ed.) Citation

Chellas, Brian F. Modal Logic: An Introduction. repr. Cambridge: Cambridge Univ. Pr, 1988.

MLA (9th ed.) Citation

Chellas, Brian F. Modal Logic: An Introduction. repr. Cambridge Univ. Pr, 1988.

Warning: These citations may not always be 100% accurate.