(1989). Listening to TOEFL: An Official TOEFL Study Aid. Princeton: Educational testing service.
Stile di citazione ChicagoListening to TOEFL: An Official TOEFL Study Aid. Princeton: Educational testing service, 1989.
Citazione MLAListening to TOEFL: An Official TOEFL Study Aid. Princeton: Educational testing service, 1989.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.