Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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