Sharpe, P. J. (1993). Practice exercise toefl. New York: Barron.
Trích dẫn kiểu ChicagoSharpe, Pamela J. Practice Exercise Toefl. New York: Barron, 1993.
MLA引文Sharpe, Pamela J. Practice Exercise Toefl. New York: Barron, 1993.
警告：這些引文格式不一定是100％准確.
APA引文