Cita APA

Nunan, D., & David Nunan. (1999). Speak out. Singapore: International Thomson Asia ELT.

Chicago Style Citation

Nunan, David, i David Nunan. Speak Out. Singapore: International Thomson Asia ELT, 1999.

Cita MLA

Nunan, David, i David Nunan. Speak Out. Singapore: International Thomson Asia ELT, 1999.

Atenció: Aquestes cites poden no estar 100% correctes.