Shay, William A. <br/><br/>
Understanding Data Communications & Networks 
William A. Shay. 
 - 2nd ed. 
 - Boston :  Vikas Publishing House,  c1999. 
 - xx, 711 p.:  [27] 
<br/><br/><label>ISBN: </label>9812400508 
<br/><br/><label>Dewey Class. No.: </label>004.6  / SHA/UND