Research and technical writing /  
Reynaldo R. Portillo.  
 - Bulacan :  Trinitas Publishing,   c2003. 
 - 259 p.  
<br/><br/>Includes bibliographical references (pp. 249-253) and index.  
<br/><br/>
<br/><br/><label>ISBN: </label>971-42-0393-7 
<br/><br/><label>Dewey Class. No.: </label>001.4 R311r 2003