Salumbides, Epifanio Jr. N. <br/><br/>
Trigonometry :  Plane and spherical. 

 - rev. ed. 
 - Quezon City :  Royal Publishing House, Inc,  c1963. 
 - x, 103 p. :  ill. ;  23 cm. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9718609008