(1989). Listening to toefl: An official toefl study aid. New York: Educational Testing Service.
Trích dẫn kiểu ChicagoListening to Toefl: An Official Toefl Study Aid. New York: Educational Testing Service, 1989.
MLA引文Listening to Toefl: An Official Toefl Study Aid. New York: Educational Testing Service, 1989.
警告:這些引文格式不一定是100%准確.