(2017). TOEFL iBT prep plus 2018-2019: 4 practice tests + proven strategies + online + audio. New York: Kaplan Publishing.
シカゴスタイル引用形TOEFL IBT Prep Plus 2018-2019: 4 Practice Tests + Proven Strategies + Online + Audio. New York: Kaplan Publishing, 2017.
MLA引用形式TOEFL IBT Prep Plus 2018-2019: 4 Practice Tests + Proven Strategies + Online + Audio. New York: Kaplan Publishing, 2017.
警告: この引用は必ずしも正確ではありません.