APA aipamena

Wallingford,T. (2015). Switching to VOIP. SPD.

Chicago Style aipamena

Wallingford,T. Switching to VOIP. Mumbai: SPD, 2015.

MLA aipamena

Wallingford,T. Switching to VOIP. SPD, 2015.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.