APA (7th ed.) Citation

Cioara, J. A., & Valentine, M. C. (2012). CCNA voice 640-461: Official cert guide (2nd ed.). Cisco Press.

Chicago Style (17th ed.) Citation

Cioara, Jeremy Author, and Michael Contributor Valentine. CCNA Voice 640-461: Official Cert Guide. 2nd ed. [Place of publication not identified]: Cisco Press, 2012.

MLA (9th ed.) Citation

Cioara, Jeremy Author, and Michael Contributor Valentine. CCNA Voice 640-461: Official Cert Guide. 2nd ed. Cisco Press, 2012.