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

 - 6th ed. 
 -  Pearson Education,  c2005. 
 - 0  ill. ; 
<br/><br/><label>ISBN: </label>NA 
<br/><br/><label>LC Class. No.: </label>4522 
<br/><br/><label>Dewey Class. No.: </label>621.38221  / cou