Cita APA (7th ed.)

Hughes, G. E., & Cresswell, M. J. (1996). A new introduction to modal logic. Routledge.

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

Hughes, G. E., i M. J. Cresswell. A New Introduction to Modal Logic. Routledge, 1996.