Norusis, Marija J. <br/><br/>
SPSS/ PC+ : base system user's guide version 5.0 

 - Chicago  SPSS Inc.  1992 
 - 910 p 
<br/><br/><label>ISBN: </label>0- 13- 177692- 4 
<br/><br/><label>LC Class. No.: </label>HA 32 .N677/