Couch II, Leon W. <br/><br/>
Digital and analog communication systems 
Leon W. Couch II. 
 - 6th ed.. 
 - Delhi  Pearson Education  c2001. 
 - xxv, 758p.; 25cm. 
<br/><br/><label>ISBN: </label>8178083280 
<br/><br/><label>Dewey Class. No.: </label>004.6  / C64D