ETS. (2016). OFFICIAL TOEFL iBT TESTS VOLUME 2 (WITH CD) (2ND ED.). MC GRAW HILL.
芝加哥风格引文ETS. OFFICIAL TOEFL IBT TESTS VOLUME 2 (WITH CD). 2ND ED. NEW DELHI: MC GRAW HILL, 2016.
MLA引文ETS. OFFICIAL TOEFL IBT TESTS VOLUME 2 (WITH CD). 2ND ED. MC GRAW HILL, 2016.
警告：这些引文格式不一定是100％准确.