Computer Networks and Internets / 
Comer, Douglas E. 
 - 2nd ed. 
 - New Jersey :  Prentice Hall,  1999. 
 - xxiii,583 p,: 
<br/><br/><label>ISBN: </label>0130836176 
<br/><br/><label>LC Class. No.: </label>TK105.5  / .C65  1999