Walton, R. (2000). Initiative: A course for advanced learners. Cambridge, UK: Cambridge University Press.
Dyfyniad Arddull ChicagoWalton, Richard. Initiative: A Course for Advanced Learners. Cambridge, UK: Cambridge University Press, 2000.
Dyfyniad MLAWalton, Richard. Initiative: A Course for Advanced Learners. Cambridge, UK: Cambridge University Press, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.