APA (7th ed.) Citation

Wilkins, S., & Smith, F. H. (2011). CCNP security secure 642-637: Official cert guide. Cisco Press.

Chicago Style (17th ed.) Citation

Wilkins, Sean, and Franklin H. Smith. CCNP Security Secure 642-637: Official Cert Guide. Indianapolis, IN: Cisco Press, 2011.

MLA (8th ed.) Citation

Wilkins, Sean, and Franklin H. Smith. CCNP Security Secure 642-637: Official Cert Guide. Cisco Press, 2011.