Cita APA (7a ed.)

Chellas, B. F. (1993). Modal logic: An introduction. Cambridge University Press.

Cita Chicago Style (17a ed.)

Chellas, Brian F. Modal Logic: An Introduction. Cambridge: Cambridge University Press, 1993.

Cita MLA (9a ed.)

Chellas, Brian F. Modal Logic: An Introduction. Cambridge University Press, 1993.