APA (7th ed.) Citation

Empson, S. (2007). CCNA portable command guide (2nd ed.). Cisco Press.

Chicago Style (17th ed.) Citation

Empson, Scott. CCNA Portable Command Guide. 2nd ed. Indianapolis, Ind: Cisco Press, 2007.

MLA (9th ed.) Citation

Empson, Scott. CCNA Portable Command Guide. 2nd ed. Cisco Press, 2007.