Nagrath, J.J. and Gopal, M. <br/><br/>
Control system engineering 

 - 5th ed. 
 - New Delhi  New Age Int. Ltd  2007 
<br/><br/><label>ISBN: </label>9788122420081 
<br/><br/><label>Dewey Class. No.: </label>629.8  / T07 NAG G