High school mathematics  : concepts and operations 
/ Milagros D. Ibe 
 - 3rd ed. 
 - Makati City :  Diwa Learning Systems,  c1999 
 - 308 p. 
<br/><br/><label>ISBN: </label>9714803152 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching