Housley, Trevor. <br/><br/>
Data communications and teleprocessing systems   
by Trevor Housley. 
 - 2nd. ed. 
 - Englewood Cliffs  Prentice-Hall  1987 
<br/><br/><label>ISBN: </label>0131974351 
<br/><br/><label>Dewey Class. No.: </label>621.38041  / N87;2