Cita APA (7a ed.)

Cisco Systems, Inc, Mason, A. G. A., & Leitch, M. C. (2011). CCNP security firewall 642-617 quick reference (1st edition.). Cisco Press.

Cita Chicago Style (17a ed.)

Cisco Systems, Inc, Andrew G Author Mason, y Max Contributor Leitch. CCNP Security Firewall 642-617 Quick Reference. 1st edition. [Place of publication not identified]: Cisco Press, 2011.

Cita MLA (9a ed.)

Cisco Systems, Inc, et al. CCNP Security Firewall 642-617 Quick Reference. 1st edition. Cisco Press, 2011.