Lythall, R.T. <br/><br/>
J&P Switchgear Book: An outline of Modern Switchgear Book 

 - 7th ED 
 - New Delhi  Aditya books private Ltd  1994 
 - 800P 
<br/><br/><label>Universal Decimal Class. No.: </label>621.316.3  / LYT.72