APA (7th ed.) Citation

Purtill, R. L. (1979). Logic: Argument, refutation, and proof. Harper & Row.

Chicago Style (17th ed.) Citation

Purtill, Richard Lawrence. Logic: Argument, Refutation, and Proof. New York <<[u.a.]>>: Harper & Row, 1979.

MLA (9th ed.) Citation

Purtill, Richard Lawrence. Logic: Argument, Refutation, and Proof. Harper & Row, 1979.