Elementary algebra / 
Alferez, Merle S. ; Duro, Ma. Cecilia A. 
 - Quezon City :  MSA Academic Advancement Institute,  2004. 
 - 327 p.; 27.4cm. 
<br/><br/>includes index 
<br/><br/><label>ISBN: </label>9719740694 
<br/><br/><label>Dewey Class. No.: </label>Fil 512 Al2 2004