Black, M. (2006). Objective IELTS Audio CD Set. Cambridge University Press.
Trích dẫn kiểu ChicagoBlack, Michael. Objective IELTS Audio CD Set. Cambridge University Press, 2006.
MLA引文Black, Michael. Objective IELTS Audio CD Set. Cambridge University Press, 2006.
警告：这些引文格式不一定是100％准确.