(1989). Understanding TOEFL: An official TOEFL study aid. Princeton: Educational testing service.
Chicago Style CitationUnderstanding TOEFL: An Official TOEFL Study Aid. Princeton: Educational testing service, 1989.
Cita MLAUnderstanding TOEFL: An Official TOEFL Study Aid. Princeton: Educational testing service, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.