Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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