Halsall. Fred <br/><br/>
Data communications, computer networks and open systems 

 - 4 
 - Delhi  Pearson Education  1999 
 - xvi, 906p. : ill.  
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>8178080982 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks<br/>Data communication<br/>Open systems