APA (7th ed.) Citation

Zwicky, E. D., Cooper, S., & Chapman, D. B. (2000). Building internet firewalls (2nd ed.). O'Reilly.

Chicago Style (17th ed.) Citation

Zwicky, Elizabeth D., Simon Cooper, and D. Brent Chapman. Building Internet Firewalls. 2nd ed. Sebastopol, California: O'Reilly, 2000.

MLA (9th ed.) Citation

Zwicky, Elizabeth D., et al. Building Internet Firewalls. 2nd ed. O'Reilly, 2000.