Logic : a textbook in deductive reasoning 
Martinez, Salvador T. 
 - Second edition. 
 -  Phoenix Publishing House.  1980 
 - xii, 231 pages. 
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<br/><br/><label>ISBN: </label>9-71060550-X 
<br/><br/><label>Dewey Class. No.: </label>F 160 M36 1980