APA (7th ed.) Citation

Chellas, B. F. (1980). Modal Logic: An introduction. C. U. Pr..

Chicago Style (17th ed.) Citation

Chellas, Brian F. Modal Logic: An Introduction. Cambridge: C. U. Pr., 1980.

MLA (9th ed.) Citation

Chellas, Brian F. Modal Logic: An Introduction. C. U. Pr., 1980.