College algebra (worktext) / 
Norma C. Morala...[et al]. 
 - Bulacan :  Trinitas Publishing,   c2005. 
 - 173 p.  
<br/><br/>
<br/><br/><label>ISBN: </label>971-42-0607-3 
<br/><br/><label>Dewey Class. No.: </label>512 C689 2005