Frahim, J., & Santos, O. (2006). Cisco ASA: All-in-one firewall, IPS, and VPN adaptative security appliance (First edition.). Cisco Press.

Frahim, Jazib, and Omar Santos. Cisco ASA: All-in-one Firewall, IPS, and VPN Adaptative Security Appliance. First edition. Indiana: Cisco Press, 2006.

Frahim, Jazib, and Omar Santos. Cisco ASA: All-in-one Firewall, IPS, and VPN Adaptative Security Appliance. First edition. Cisco Press, 2006.