Held, Gilbert, <br/><br/>
Understanding data communications 

 - Chichester ;  New York :  Wiley,  1994 
 - 431 pages :   ; 
<br/><br/>Includes Bibliography  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems.<br/>Computer networks.
<br/><br/><label>National Library of Medicine Call No.: </label>QA76.25