Deuna, Melecio C. <br/><br/>
Basic trigonometry for secondary Schools / 
Melecio C. Deuna, Florita C. Lamaya. 
 - Quezon City :  SIBS Pub. House,  c1998. 
 - ix, 347 p. : ill. 
<br/><br/> Includes appendices, glossary, bibliography and index. 
<br/><br/><label>ISBN: </label>9717910391 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trigonometry--Study and teaching (Secondary)