APA Citatie

O'Neill, R., & Richard O'Neill. (2014). Unlock: Listening and speaking skills. Cambridge: Cambridge University Press.

Chicago Style citaat

O'Neill, Richard, en Richard O'Neill. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.

MLA citatie

O'Neill, Richard, en Richard O'Neill. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.

Let op: Deze citaties zijn niet altijd 100% accuraat.