Cita APA (7th ed.)

Hughes, G. (1998). A new introduction to modal logic. Routledge.

Cita Chicago (17th ed.)

Hughes, G.E. A New Introduction to Modal Logic. London: Routledge, 1998.

Cita MLA (9th ed.)

Hughes, G.E. A New Introduction to Modal Logic. Routledge, 1998.