APA引文

O'Connell, S. (2002). Focus on IELTS. London: Pearson education.

Trích dẫn kiểu Chicago

O'Connell, Sue. Focus On IELTS. London: Pearson education, 2002.

MLA引文

O'Connell, Sue. Focus On IELTS. London: Pearson education, 2002.

警告:这些引文格式不一定是100%准确.