Robles, Elizabeth Landicho <br/><br/>
Trigonometry / 
Elizabeth Landicho Robles. 
 - Quezon City :  MSA Publishing House,  2001. 
 - [180 p.]: 27.3 cm. 
<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>971-8740-33-3 
<br/><br/><label>LC Class. No.: </label>516.24 R57