Cita APA (7a ed.)

Hooper, H. (2012). CCNP Security VPN 642-648 official cert guide (2nd ed.). Cisco Press.

Cita Chicago Style (17a ed.)

Hooper, Howard. CCNP Security VPN 642-648 Official Cert Guide. 2nd ed. Indianapolis, Ind.: Cisco Press, 2012.

Cita MLA (8a ed.)

Hooper, Howard. CCNP Security VPN 642-648 Official Cert Guide. 2nd ed. Cisco Press, 2012.