Bryman, Alan, <br/><br/>
Quantitative data analysis with SPSS for windows :  a guide for social scientists / 
Alan Bryman and Duncan Cramer. 
 - London:  Routledge,  1997. 
 - 318 pages :  illustrations ;  24 cm. 
<br/><br/>page 309-311 
<br/><br/><label>ISBN: </label>0415147204  RM66.64 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Statistical methods--Computer programs<br/>SPSS for Windows