Modern plane trigonometry / 
Lactuan, Leo L. 
 - Malabon City :  Jimczyville Publications,  2016. 
 - iv, 302 p.; 22.9cm. 
<br/><br/>includes references 
<br/><br/><label>ISBN: </label>9789719676263 
<br/><br/><label>Dewey Class. No.: </label>Fil 516.5 L151 2016