Understanding data communications / 
revised by Gilbert Held. 
 - 5th ed. 
 - Indianapolis, IN :  SAMS Pub,  c1996. 
 - xv, 504p. : ill. ; 21 cm. 
<br/><br/> Glossary : p. 469-476. Bibliography : p. 477-478. Includes index. 
<br/><br/><label>ISBN: </label>9716560834 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems.<br/>Computer networks.