Nunan, D. (1999). Speak out 2. Singapore: Thomson Asia.
Trích dẫn kiểu ChicagoNunan, David. Speak Out 2. Singapore: Thomson Asia, 1999.
MLA引文Nunan, David. Speak Out 2. Singapore: Thomson Asia, 1999.
警告：这些引文格式不一定是100％准确.
APA引文