Cita APA (7a ed.)

Watkins, M., & Wallace, K. (2008). CCNA security official exam certification guide. Cisco Press.

Cita Chicago Style (17a ed.)

Watkins, Michael, y Kevin Wallace. CCNA Security Official Exam Certification Guide. Indianapolis, Ind.: Cisco Press, 2008.

Cita MLA (8a ed.)

Watkins, Michael, y Kevin Wallace. CCNA Security Official Exam Certification Guide. Cisco Press, 2008.