Humphreys, P. (2006). IELTS express: Intermediate. London: Thomson.
Trích dẫn kiểu ChicagoHumphreys, Pamela. IELTS Express: Intermediate. London: Thomson, 2006.
MLA引文Humphreys, Pamela. IELTS Express: Intermediate. London: Thomson, 2006.
警告:這些引文格式不一定是100%准確.