APA引文

Firth, M., & Matt Firth. (2014). Unlock: Listening and speaking skills. Cambridge: Cambridge University Press.

Trích dẫn kiểu Chicago

Firth, Matt, và Matt Firth. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.

MLA引文

Firth, Matt, và Matt Firth. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.

警告：這些引文格式不一定是100％准確.