Johnson, Charles D. <br/><br/>
Communication systems / 

 - Tinley Park  Goodheart-Willcox Co.,  2000. 
 - 478 p. :  ill. ;  29 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>1566376157 
<br/><br/><label>LC Class. No.: </label>P96.T42  / .J62 2000