APA (7th ed.) Citation

Wallingford, T. (2005). Switching to VoIP. O'Reilly.

Chicago Style (17th ed.) Citation

Wallingford, Ted. Switching to VoIP. Beijing [etc.]: O'Reilly, 2005.

MLA (9th ed.) Citation

Wallingford, Ted. Switching to VoIP. O'Reilly, 2005.

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