APA aipamena

(2007). TOEFL iBT Tips: How to prepare for the TOEFL iBT. USA: ETS.

Chicago Style aipamena

TOEFL IBT Tips: How to Prepare for the TOEFL IBT. USA: ETS, 2007.

MLA aipamena

TOEFL IBT Tips: How to Prepare for the TOEFL IBT. USA: ETS, 2007.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.