Research methods / 
Consuelo G. Sevilla ... [et al.]. 
 - Rev. ed 
 - Manila :  REX Bookstore,  c1992. 
 - xiv, 333 p. 
<br/><br/> Includes bibliography and index. 
<br/><br/><label>ISBN: </label>971-23-1058-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research