APA (7th ed.) Citation

Cioara, J., & Valentine, M. (2015). CCNA voice 640-461: Official cert guide. Cisco Press.

Chicago Style (17th ed.) Citation

Cioara, Jeremy, and Mike Valentine. CCNA Voice 640-461: Official Cert Guide. Indianapolis: Cisco Press, 2015.

MLA (9th ed.) Citation

Cioara, Jeremy, and Mike Valentine. CCNA Voice 640-461: Official Cert Guide. Cisco Press, 2015.

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