Walker, R. W. (2009). Oxford English for careers tourism 3. Oxford University Press.
Dyfyniad Arddull ChicagoWalker, Robin Walker. Oxford English for Careers Tourism 3. Oxford University Press, 2009.
Dyfyniad MLAWalker, Robin Walker. Oxford English for Careers Tourism 3. Oxford University Press, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.