Das,J ,  Mullick, S K &  Chatterjee,P K <br/><br/>
Principles of digital communication 

 - New Age International, Mumbai  1986 
 - xv,645p 
<br/><br/><label>ISBN: </label>0-85226-150 
<br/><br/><label>Dewey Class. No.: </label>621.381 Das