(2007). TOEFL iBT Tips: How to prepare for the TOEFL iBT. USA: ETS.
Trích dẫn kiểu ChicagoTOEFL IBT Tips: How to Prepare for the TOEFL IBT. USA: ETS, 2007.
MLA引文TOEFL IBT Tips: How to Prepare for the TOEFL IBT. USA: ETS, 2007.
警告：这些引文格式不一定是100％准确.
APA引文