por Kent, Peter [autor] | Barrera Ugalde, Ricardo de la [traductor].
por Siyan, Karanjit, 1954- [autor] | Siyan, Karanjit, 1954-. Internet firewalls and network security | Hare, R. Chris, 1962- [autor] | Mena, Jorge Iván [traductor] | Siyan, Karanjit, 1954-. Internet firewalls and network security.