APA (7th ed.) Citation
Hughes, G. E., & Cresswell, M. J. (1996). A new introduction to modal logic. Routledge.
Chicago Style (17th ed.) Citation
Hughes, G. E., and M. J. Cresswell. A New Introduction to Modal Logic. London ; New York: Routledge, 1996.
MLA (9th ed.) Citation
Hughes, G. E., and M. J. Cresswell. A New Introduction to Modal Logic. Routledge, 1996.
Warning: These citations may not always be 100% accurate.