Cioara, J., Cavanaugh, M. J., & Krake, K. A. (2009). CCNA voice official exam certification guide. Cisco Press.
Cita Chicago Style (17a ed.)Cioara, Jeremy, Michael J. Cavanaugh, y Kris A. Krake. CCNA Voice Official Exam Certification Guide. Indianapolis, Ind.: Cisco Press, 2009.
Cita MLA (8a ed.)Cioara, Jeremy, et al. CCNA Voice Official Exam Certification Guide. Cisco Press, 2009.
Precaución: Estas citas no son 100% exactas.