Best, John W. <br/><br/>
Research in education .-3rd ed. 
John W. Best 
 - 3rd ed. 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  c1977 
 - xii, 403p. :  ill. ; 
<br/><br/><label>Universal Decimal Class. No.: </label>51:001.8  / BES