Couch, Leon W.  <br/><br/>
Digital and analog communication systems / 

 - 6th.  
 - New Delhi,  Pearson Education,  c2004. 
 - xxv, 758 p. ;  ill. ;  23 cm.  
<br/><br/><label>ISBN: </label>8178083280 
<br/><br/><label>LC Class. No.: </label>9263 
<br/><br/><label>Dewey Class. No.: </label>621.382  / COU