Singh Ashok. <br/><br/>
Principal Of Communication Engineering 

 - New Delhi :  S.Chand & Company.  c1984. 
 - vii, 606 p.:  [C4] 
<br/><br/><label>ISBN: </label>8121904765 
<br/><br/><label>Dewey Class. No.: </label>621.3  / SIN/PRI