Trevor Housley <br/><br/>
Data Communications and Teleprocessing Systems 

 - 
 -  Prentice-Hall  1987 
 - 474 
<br/><br/>  
<br/><br/><label>ISBN: </label>0-13-197393-2 
<br/><br/><label>Dewey Class. No.: </label>621.39