Basic electricity 
Valkenburgh, Van. 
 - Revised edition. 
 -  Nooger & Neville, Inc.  1987 
 - 4-128. 
<br/><br/>
<br/><br/><label>ISBN: </label>9-71084423-7 
<br/><br/><label>Dewey Class. No.: </label>621.394 Val23b 1987