APA (7th ed.) Citation

Wilkins, S., & Smith, F. (2011). CCNP Security Secure 642-637 Official Cert Guide (1st edition.). Cisco Press.

Chicago Style (17th ed.) Citation

Wilkins, Sean, and Franklin Smith. CCNP Security Secure 642-637 Official Cert Guide. 1st edition. Cisco Press, 2011.

MLA (9th ed.) Citation

Wilkins, Sean, and Franklin Smith. CCNP Security Secure 642-637 Official Cert Guide. 1st edition. Cisco Press, 2011.

Warning: These citations may not always be 100% accurate.