Bolton, W. <br/><br/>
Programmable logic controllers :  an introduction / 

 - 3rd ed. 
 - Oxford ;  Newnes,  2003. 
 - ix, 240 p. :  ill. ;  25 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0750659866 
<br/><br/><label>LC Class. No.: </label>TJ223.P76  / B63 2003