Business data communications. 
By William Stalling. 
 - 5th. 
 - New Delhi.:  Pearson education.,  2008. 
 - xi, 584 p.:  ill.;  22 cm. 
<br/><br/><label>ISBN: </label>978-81-317-1679-3 
<br/><br/><label>Subjects--Index Terms: </label>Computer science. Data communication. 
<br/><br/><label>Dewey Class. No.: </label>004.6