APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Purtill, Richard L. Logic: Argument, Refutation, and Proof. Harper & Row Publishers Inc, 1979.

MLA (8th ed.) Citation

Purtill, Richard L. Logic: Argument, Refutation, and Proof. Harper & Row Publishers Inc, 1979.

Warning: These citations may not always be 100% accurate.