The Princeton Review. (2022). The princeton review toefl ibt prep 2022. Princeton Review.
芝加哥风格引文The Princeton Review. The Princeton Review Toefl Ibt Prep 2022. New York: Princeton Review, 2022.
MLA引文The Princeton Review. The Princeton Review Toefl Ibt Prep 2022. Princeton Review, 2022.
警告：这些引文格式不一定是100％准确.