APA (7th ed.) Citation

Vacca, J. R., & Ellis, S. R. (2005). Firewalls: Jumpstart for network and systems administrators. Elsevier Digital Press.

Chicago Style (17th ed.) Citation

Vacca, John R., and Scott R. Ellis. Firewalls: Jumpstart for Network and Systems Administrators. Amsterdam , Boston: Elsevier Digital Press, 2005.

MLA (8th ed.) Citation

Vacca, John R., and Scott R. Ellis. Firewalls: Jumpstart for Network and Systems Administrators. Elsevier Digital Press, 2005.