Cita APA

Cioara, J., Cavanaugh, M. J., & Krake, K. A. (2008). CCNA Voice official Exam certification guide. USA: Cisco press.

Citación estilo Chicago

Cioara, Jeremy, Michael J. Cavanaugh, y Kris A. Krake. CCNA Voice Official Exam Certification Guide. USA: Cisco press, 2008.

Cita MLA

Cioara, Jeremy, Michael J. Cavanaugh, y Kris A. Krake. CCNA Voice Official Exam Certification Guide. USA: Cisco press, 2008.