(1989). Listening to toefl: An official toefl study aid. New York: Educational Testing Service.
Citação norma ChicagoListening to Toefl: An Official Toefl Study Aid. New York: Educational Testing Service, 1989.
Citação norma MLAListening to Toefl: An Official Toefl Study Aid. New York: Educational Testing Service, 1989.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.