APA aipamena

Patterson, A. R., & Alison Ramage Patterson. (2014). Unlock: Listening and speaking skills. Cambridge: Cambridge University Press.

Chicago Style aipamena

Patterson, Alison Ramage, và Alison Ramage Patterson. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.

MLA aipamena

Patterson, Alison Ramage, và Alison Ramage Patterson. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.