Borg Walter R. <br/><br/>
Educational Research :  an ntroduction. 

 - 5th  ed. 
 - london :  Longman,  1989. 
 - 939  p. ;    cm. 
<br/><br/>index. 
<br/><br/><label>ISBN: </label> $ 
<br/><br/><label>Subjects--Topical Terms: </label><br/>educational research.