Day, J., & Jeremy Day. (2014). Unlock: Listening and speaking skills. Cambridge: Cambridge University Press.
Dyfyniad Arddull ChicagoDay, Jeremy, và Jeremy Day. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.
Dyfyniad MLADay, Jeremy, và Jeremy Day. Unlock: Listening and Speaking Skills. Cambridge: Cambridge University Press, 2014.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.