APA引文

Humphreys, P. (2006). IELTS express: Intermediate. London: Thomson.

Trích dẫn kiểu Chicago

Humphreys, 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.