Pangilinan, Jocelyn C. <br/><br/>
Virtual manipulatives: its effectiveness in teaching trigonometry to college students at New Era University 
Jocelyn C. Pangilinan 
 - Quezon City  New Era University  2010 
 - xiii, 89p. 
<br/><br/>Master of Arts 
<br/><br/><label>LC Class. No.: </label>CD-01876t