Johnson R A <br/><br/>
Applied multivariate statistical analysis 
Johnson R A; Wichern D W 
 - 2 
 - New Jersey  New Jersey, Prentice-Hall International  1988 
 - 623p 
<br/><br/><label>ISBN: </label>0-13-041138-8 
<br/><br/><label>Source: </label>Textbook