Held, Gill and Sarch, Ray. <br/><br/>
Data communication: A comprehensive approach. 

 - 3rd ed. 
 - New York     McGraw-Hill    1991 
 - 587p. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer Networking
<br/><br/><label>Dewey Class. No.: </label>004.6 HEL