Mckeague, Charles P. <br/><br/>
Trigonometry / 
Charles P. Mckeague and Mark D. Turner. 
 - 7th ed. 
 - Philippines:  Cengage learning:  2014. 
 - xvi, 498 p.  ill. 
<br/><br/>Includes bibliographical index. 
<br/><br/>
<br/><br/><label>ISBN: </label>9789814591379 
<br/><br/><label>Dewey Class. No.: </label>516.24  / M154 2014 c.2