Cita APA (7th ed.)

Smullyan, R. M. (1968). First-order logic. Springer-Verlag.

Cita Chicago (17th ed.)

Smullyan, Raymond M. First-order Logic. Berlín: Springer-Verlag, 1968.

Cita MLA (9th ed.)

Smullyan, Raymond M. First-order Logic. Springer-Verlag, 1968.