Diana Hopkins. (2002). Passport to IELTS. London: Longman.
Trích dẫn kiểu ChicagoDiana Hopkins. Passport to IELTS. London: Longman, 2002.
MLA引文Diana Hopkins. Passport to IELTS. London: Longman, 2002.
警告：这些引文格式不一定是100％准确.
APA引文