Proficiency workbook I :  elementary algebra / 
Diwa Scholastic Press 
 - Makati City :  Diwa Learning Systems, Inc.,  2006 . 
 - 122 pages :  figure;  26 cm. 
<br/><br/><label>ISBN: </label>9714807964 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Algebra
<br/><br/><label>Dewey Class. No.: </label>512.904  / P94