SPSS 6.1 Syntax reference guide. 

 - Chicago, Ill. :  SPSS Inc.,  1994. 
 - ix, 941 p. :  ill. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0134382501 
<br/><br/><label>Subjects--Topical Terms: </label><br/>SPSS (Computer program).<br/>Technology--Computers and computer technology.