21st century mathematics ; second year / 
Lucy O. Sia ... [et al.]. 
 - Quezon City :  Phoenix Pub. House,  c1995. 
 - ix, 534 pages :   illustrations ;   25 cm 
<br/><br/> Bibliography : p. 529. 
<br/><br/><label>ISBN: </label>9710616153 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching
<br/><br/><label>LC Class. No.: </label>QA14   / P53T91 1995