De Vera, D.A. <br/><br/>
A brief guide to symbolic logic / 
Dennis A. De Vera. 
 - Metro Manila:  Grandwater Publishing Inc.,  c2010. 
 - 192 p.;  22 cm. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>978-971-94677-7-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic.
<br/><br/><label>Dewey Class. No.: </label>GC 160 D493 2010