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Carney J. D., Scheer R. K., . (1980). Fundamentals of logic. New York, USA: Macmillan Pub.
Carney James D, Scheer Richard K, . 1980. Fundamentals of logic. New York, USA: Macmillan Pub.
Carney James D, Scheer Richard K, . Fundamentals of logic. New York, USA: Macmillan Pub. 1980.
