Held, Gilbert <br/><br/>
Understanding data communications 

 - 4 
 - New Delhi  Prentice-Hall of India  1994 
 - xvii, 431p. : ill. ;  
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>8120310802 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communication networks<br/>Computer networks