APA (7th ed.) Citation

Wallingford, T. (2005). Switching to VoIP (First edition.). O'Relly Media.

Chicago Style (17th ed.) Citation

Wallingford, Ted. Switching to VoIP. First edition. Sebastopol, Estados unidos: O'Relly Media, 2005.

MLA (9th ed.) Citation

Wallingford, Ted. Switching to VoIP. First edition. O'Relly Media, 2005.

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