George, Darren  & Mallery, Paul <br/><br/>
SPSS for windows steps by steps  a simple guide and reference 13.0 update 

 - 6th ed 
 - Pearson Education, New Delhi  c2006 
 - 386 
<br/><br/><label>ISBN: </label>81-317-0394-0 
<br/><br/><label>Dewey Class. No.: </label>005.5 Geo/Mal