Shaughnessy, John J. <br/><br/>
Research methods in psychology  [Book]. 

 - 7th 
 - USA  McGraw hill  2006 
<br/><br/> All. 
<br/><br/><label>ISBN: </label>0072986220 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research methods in psychology