Shaughnessy ,J .John etal. <br/><br/>
Research  Methods in Psychology 

 - 10 th ed 
 - New York  MC-Graw-Hill  2012 
 - X III, 489 P 
<br/><br/><label>ISBN: </label>978-1-259-2596-9 
<br/><br/><label>LC Class. No.: </label>BF 76.5  / .S 53