Cita APA

Hughes, G. E. 1., & Cresswell, M. J. (1972). An introduction to modal logic. Methuen.

Citación estilo Chicago

Hughes, G. E. 1918-, and M. J. Cresswell. An Introduction to Modal Logic. London: Methuen, 1972.

Cita MLA

Hughes, G. E. 1918-, and M. J. Cresswell. An Introduction to Modal Logic. London: Methuen, 1972.