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Cohen, M. R., & Nagel, E. (1995). An Introduction to logic and scientific method (1st Ed.). New Delhi: Allied Publishers Limited.

Cohen, Morris R., and Ernest Nagel. An Introduction to Logic and Scientific Method. 1st Ed. New Delhi: Allied Publishers Limited, 1995.

Cohen, Morris R., and Ernest Nagel. An Introduction to Logic and Scientific Method. 1st Ed. New Delhi: Allied Publishers Limited, 1995.