Cita APA (7a ed.)

Hansteen, P. N. M. (2008). The book of PF: A no-nonsense guide to the OpenBSD firewall (1st edition.). No Starch Press.

Cita Chicago Style (17a ed.)

Hansteen, Peter N. M. The Book of PF: A No-nonsense Guide to the OpenBSD Firewall. 1st edition. San Francisco: No Starch Press, 2008.

Cita MLA (9a ed.)

Hansteen, Peter N. M. The Book of PF: A No-nonsense Guide to the OpenBSD Firewall. 1st edition. No Starch Press, 2008.