Cita APA (7a ed.)

Cisco Systems, Inc, Matei, C. A., & Myers, R. C. (2011). CCNP security VPN 642-647 quick reference (1st edition.). Cisco Press.

Cita Chicago Style (17a ed.)

Cisco Systems, Inc, Cristian Author Matei, y Rasheim Contributor Myers. CCNP Security VPN 642-647 Quick Reference. 1st edition. [Place of publication not identified]: Cisco Press, 2011.

Cita MLA (9a ed.)

Cisco Systems, Inc, et al. CCNP Security VPN 642-647 Quick Reference. 1st edition. Cisco Press, 2011.