Ballena, N. <br/><br/>
Science, technology, & society 
Ballena, Naressia Seludo D. 
 - Bulacan :   Trinitas Publishing, inc.,   c2004 
 - 324 pages :   23 cm. 
<br/><br/>Includes bibliographical references 
<br/><br/><label>ISBN: </label>971-42-0606-5 
<br/><br/><label>Dewey Class. No.: </label>Fil. 303.483 Sc416 2004