Data and Computer Communications/  English. 
William Stallings. 
 - 7th Ed. 
 - India:  Asoke K.Ghosh, Prentice-Hall of India Priavte Limited,  2004. 
 - xv,847p.:  ill.;  23cm. 
<br/><br/><label>ISBN: </label>8120323556 
<br/><br/><label>Dewey Class. No.: </label>681.14:65.012.45  / STA