1. Cohen, M. R. and Nagel, Ernest. 1934.An Introduction to Logic and Scientific Method17New York
2. Copi, Irving M. 1961.Introduction to Logic3–6. New York
3. Russell, Bertrand. 1960.Our Knowledge of the External World33–53. New York
4. Stebbing, L. S. 1961.A Modern Introduction to Logic121New York
5. Angell, Richard. 1964.Reasoning and Logic56165259New York