Cita APA (7a ed.)

Hughes, R. I. G. (1993). A philosophical companion to first-order logic. Hackett.

Cita Chicago Style (17a ed.)

Hughes, R. I. G. A Philosophical Companion to First-order Logic. Indianapolis [etc.]: Hackett, 1993.

Cita MLA (9a ed.)

Hughes, R. I. G. A Philosophical Companion to First-order Logic. Hackett, 1993.