Introduction to logic 
Copi, Irving M. 
 - Seventh edition. 
 -  McMillan Publishing Company.  1986 
 - xiv, 612 pages. 
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<br/><br/><label>ISBN: </label>9-71105531-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic.
<br/><br/><label>Dewey Class. No.: </label>160 C63 1986