George, D   <br/><br/>
SPSS for windows step by step 
by D  George 
 - India   Dorling Kindersley      2006 
 - 386 p. 
<br/><br/><label>Source: </label>Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> WJ  Nilsen