Franklin

MLA

Vacca, John R, and Scott Ellis. Firewalls: Jumpstart for Network and Systems Administrators. 1st edition Amsterdam: Elsevier Digital, 2005.

APA

Vacca, J. R, & Ellis, S. (2005). Firewalls: jumpstart for network and systems administrators. 1st edition Amsterdam: Elsevier Digital.

Chicago

Vacca, John R., and Scott Ellis. Firewalls: Jumpstart for Network and Systems Administrators. 1st edition Amsterdam: Elsevier Digital, 2005.