Stallings, William <br/><br/>
Data and computer communications. 
William Stallings 
 - 5th ed.; 
 - New Jersy:  Prentice-Hall;  1997. 
 - xviii; 789 p. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0-13-571274-2 
<br/><br/><label>Dewey Class. No.: </label>004.6 STD