APA (7th ed.) Citation

Chapman, B. D., & Zwicky, E. D. (1995). Building internet firewalls. O'Reilly & Associates.

Chicago Style (17th ed.) Citation

Chapman, Brent D., and Elizabeth D. Zwicky. Building Internet Firewalls. Sebastopol Calif: O'Reilly & Associates, 1995.

MLA (9th ed.) Citation

Chapman, Brent D., and Elizabeth D. Zwicky. Building Internet Firewalls. O'Reilly & Associates, 1995.