Bigelow, Stephen J..  <br/><br/>
Understanding Telephone Electronics /  
Bigelow Stephen J., Carr Joseph J., Winder Steve. 
 - 4 edition. 
 - Boston :   Newnes,   2001. 
 - XIV, 402 s.:   il.;   23 cm. 
<br/><br/><label>ISBN: </label>0750671750