Nunan, D. (1999). Speak out 3. Singapore: Thomson Asia.
Trích dẫn kiểu ChicagoNunan, David. Speak Out 3. Singapore: Thomson Asia, 1999.
MLA引文Nunan, David. Speak Out 3. Singapore: Thomson Asia, 1999.
警告：這些引文格式不一定是100％准確.
APA引文