O'Neill, R., & Richard O'Neill. (2014). Unlock: Listening and speaking skills. Cambridge: Cambridge University Press.
Trích dẫn kiểu ChicagoO'Neill, Richard, và Richard O'Neill. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.
MLA citiranjeO'Neill, Richard, và Richard O'Neill. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.
Opozorilo: Ti citati niso vedno 100% točni.