Gregory, Robert J. <br/><br/>
Psychological testing :  History, principles and applications/ 
Robert J. Gregory 
 - 7th ed.  Global ed. 
 - New York  Pearson  2015 
 - 589p. 
<br/><br/><label>ISBN: </label>978-0205959259 
<br/><br/><label>LC Class. No.: </label>BF176  / .G74 2015