Montemayor, Felix M. <br/><br/>
Harmony of Logic / 
Felix M. Montemayor. 
 - Rev. ed. 
 - Manila :  National Book Store,  c1993. 
 - 283 p. 
<br/><br/> Includes appendices and index. 
<br/><br/><label>ISBN: </label>971-08-5647-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic<br/>Logic, Symbolic and mathematical