Cita APA (7a ed.)

Szabo, M. E. (1978). Algebra of proofs. North-Holland.

Cita Chicago Style (17a ed.)

Szabo, M. E. Algebra of Proofs. Amsterdam [etc.]: North-Holland, 1978.

Cita MLA (9a ed.)

Szabo, M. E. Algebra of Proofs. North-Holland, 1978.