Croft, Terrell; Summers, Wilford I; Hartwell, Frederic P <br/><br/>
American Electricians Handbook 

 -  Mc Graw Hill  2009 
<br/><br/><label>ISBN: </label>9780071494625 
<br/><br/><label>Universal Decimal Class. No.: </label> / 621.3(021) CRO.09