APA (7th ed.) Citation

Hughes, G. E., & Cresswell, M. J. (1984). A companion to modal logic. Methuen.

Chicago Style (17th ed.) Citation

Hughes, G. E., and M. J. Cresswell. A Companion to Modal Logic. London ; New York: Methuen, 1984.

MLA (9th ed.) Citation

Hughes, G. E., and M. J. Cresswell. A Companion to Modal Logic. Methuen, 1984.