Dixon R Doll <br/><br/>
Data Communications , Facilities,Networks and Systems Design 

 - 
 -  John Wiley and Sons  1978 
 - 493 
<br/><br/>  
<br/><br/><label>ISBN: </label>0-471-21768-9 
<br/><br/><label>Dewey Class. No.: </label>621.39