Stalling,Williams <br/><br/>
Data and computer communications/ 

 - 9th ed. 
 - Jersey  Pearson education inc  2011 
 - 881p. 
<br/><br/><label>ISBN: </label>978 0 13 217217 2 
<br/><br/><label>LC Class. No.: </label>SBL TK 5105   / S73 2011