Electrical engineer's reference book 
edited by M.G. Say 
 - 13th ed 
 - London  Butterworths  1973 
 - 1v. (various pagings) : ill. ; 23 cm. 
<br/><br/><label>ISBN: </label>0408702893 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric engineering--Handbooks, manuals, etc.