Michalos. Improving Your Reasoning (2nd edition.). Prentice-Hall.
Cita Chicago (17th ed.)Michalos. Improving Your Reasoning. 2nd edition. Prentice-Hall.
Cita MLA (9th ed.)Michalos. Improving Your Reasoning. 2nd edition. Prentice-Hall.
Atenció: Aquestes cites poden no estar 100% correctes.