Chapman D. Brent  & Zwicky D. Elizabeth <br/><br/>
Building internet firewalls 

 - 1st ed. 
 - O'Reilly & Associates, America  1995 
 - xxvi;517p. 
<br/><br/><label>ISBN: </label>1-56592-124-0 
<br/><br/><label>Dewey Class. No.: </label>004.679 Cha/Zwi