Roddy, Dennis. <br/><br/>
Electronic communications / 
Dennis Roddy, John Coolen. 
 - 2nd ed. 
 - Reston, Va. :  Reston Pub. Co.,  1981. 
 - xii, 628p. :  ill. ;  25cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0835916316 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication<br/>Electronics