Held, Gilbert <br/><br/>
Understanding Data Communications  :from fundamentals to networking 

 - 3rd ed. 
 - New York  John Wiley & Sons  2000 
 - xiii,852p.:  ill.; 
<br/><br/>Include index 
<br/><br/><label>ISBN: </label>0471627453 
<br/><br/><label>LC Class. No.: </label>TK 5105  / .H37 2000