Ostrowska, S., & Sabina Ostrowska. (2014). Unlock: Listening and speaking skills. Cambridge: Cambridge University Press.
Chicago Style citaatOstrowska, Sabina, en Sabina Ostrowska. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.
MLA citatieOstrowska, Sabina, en Sabina Ostrowska. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.
Let op: Deze citaties zijn niet altijd 100% accuraat.