Leach, Donald P <br/><br/>
Digital: principles and application 

 - 5th edition. 
 - New Delhi :  Tata Mcgraw Hill, 
 - 638. 
<br/><br/><label>ISBN: </label>0070672580 
<br/><br/><label>Dewey Class. No.: </label>621.395  / LEA