George, Darren; Mallery, Paul <br/><br/>
SPSS for Windows step by step: a simple guide and reference 13.0 update 

 - 6th ed. 
 - England  Pearson Education Ltd.,  2006 
 - 386 p. 
<br/><br/><label>ISBN: </label>81 317 0394 0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>STATISTICS