Zimmerman S M <br/><br/>
Statistical quality control : using exclel 
Zimmerman S M; Icenogle M L 
 - USA  USA, ASQ Quality Press  1999 
 - 346p 
<br/><br/><label>ISBN: </label>0-87389-393-X 
<br/><br/><label>Source: </label>Textbook