Helmstadter, G.C. <br/><br/>
Principles of Psychological Measurement 

 - London  Methuen & Co. Ltd  1966 
 - xx, (2), 248  Hb 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>
<br/><br/><label>Dewey Class. No.: </label>151.2