Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Wallingford, Ted. Switching to VoIP. First edition. Beijing: O'Reilly, 2005.

Cita MLA (9a ed.)

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