Harmony of logic 
Montemayor, Felix M. 
 - revised edition. 
 -  National Book Store, Inc.  1983 
 - 276 pages. 
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<br/><br/><label>ISBN: </label>9-71085647-2 
<br/><br/><label>Dewey Class. No.: </label>F 160 M76h 1983