Gilbert Held <br/><br/>
Understanding Data Communications: From Fundamentals To Networking 

 - 2nd ed 
 -   John Wiley & Sons, Ltd  ©1996 
<br/><br/><label>ISBN: </label>9780471968207  222.75 
<br/><br/><label>Dewey Class. No.: </label>004.6 HEL.2