Wiersma, William. <br/><br/>
Research methods in education :  an introduction / 
William Wiersma. 
 - 5th ed. 
 - Boston :  Allyn and Bacon,  c1991. 
 - xvii, 443 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>0205127495 
<br/><br/><label>LCCN: </label>90043168  
<br/><br/><label>LC Class. No.: </label>LB1028 .W54 1991  / .W517 1991 
<br/><br/><label>Dewey Class. No.: </label>370/.7/8