Lougheed, L. (2011). Direct to TOEFL iBT: Student's book. Macmillan Education.
芝加哥风格引文Lougheed, Lin. Direct to TOEFL IBT: Student's Book. [Bangkok, Thailand]: Macmillan Education, 2011.
MLA引文Lougheed, Lin. Direct to TOEFL IBT: Student's Book. Macmillan Education, 2011.
警告：这些引文格式不一定是100％准确.