Walker, R. (2006). Tourism 1: Student's Book. Oxford: Oxford University Press.
Dyfyniad Arddull ChicagoWalker, Robin. Tourism 1: Student's Book. Oxford: Oxford University Press, 2006.
Dyfyniad MLAWalker, Robin. Tourism 1: Student's Book. Oxford: Oxford University Press, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.