Petruzella , Frank D <br/><br/>
Programmable logic controllers 

 - 3 
 -   Tata McGraw Hill Publishing Co. Ltd., New Delhi  2011 
 - 468 
<br/><br/><label>ISBN: </label>1868 
<br/><br/><label>Dewey Class. No.: </label>005.115  PET-P3