Citazione APA

(1989). Listening to TOEFL: An Official TOEFL Study Aid. Princeton: Educational testing service.

Stile di citazione Chicago

Listening to TOEFL: An Official TOEFL Study Aid. Princeton: Educational testing service, 1989.

Citazione MLA

Listening to TOEFL: An Official TOEFL Study Aid. Princeton: Educational testing service, 1989.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.