Hackworth, John R and HackWorth, Frederick D.  <br/><br/>
Programmable logic controllers / 

 - New Delhi,   Pearson Education,  c2007. 
 - 315p. ;  ill. ;  24 cm.  
<br/><br/><label>ISBN: </label>8177587714 
<br/><br/><label>Dewey Class. No.: </label>629.8921