Van Dalen  <br/><br/>
Understanding educational research : an introduction  
/ Deobold B. Van Dalen, William J. Meyer. 
 - Enl. Rev.. 
 - New York  McGraw-Hill  1966. 
 - x, 525p.  ill.  24cm 
<br/><br/> Includes index p.421 - 432 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education--Research
<br/><br/><label>Dewey Class. No.: </label>370.78 VAN 1962