APA ציטוט

Hughes, G. E., & Cresswell, M. J. (1996). A new introduction to modal logic. London ; New York.

Chicago Style Citation

Hughes, G. E., and M. J. Cresswell. A New Introduction to Modal Logic. London ; New York, 1996.

ציטוט MLA

Hughes, G. E., and M. J. Cresswell. A New Introduction to Modal Logic. London ; New York, 1996.