Electrical engineer's reference book / 
edited by M.G. Say.  
 - 13th ed.  
 - London :  Butterworth,  1973. 
 - Various pagings :  ill. ;  23 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0408702893 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical engineering
<br/><br/><label>Dewey Class. No.: </label>621.3