Communication networks 
Alberto Leon Gracia, Indra Widjaja. 
 - New Delhi  Tata McGrawHill Publishing Company  2000 
 - xxii, 867p., 26cm. 
<br/><br/><label>ISBN: </label>0-07-022839-6. 
<br/><br/><label>Dewey Class. No.: </label>004.67  / L49C