Cita APA (7a ed.)

Hughes, G. E., & Cresswell, M. (1984). A companion to modal logic. Methuen.

Cita Chicago Style (17a ed.)

Hughes, G. E., y M.J Cresswell. A Companion to Modal Logic. London [etc.]: Methuen, 1984.

Cita MLA (9a ed.)

Hughes, G. E., y M.J Cresswell. A Companion to Modal Logic. Methuen, 1984.