Gairns, R., & Redman, S. (2003). Natural English: Upper-intermediate student's book. Oxford University Press.
Dyfyniad Arddull ChicagoGairns, Ruth, and Stuart Redman. Natural English: Upper-intermediate Student's Book. Oxford: Oxford University Press, 2003.
Dyfyniad MLAGairns, Ruth, and Stuart Redman. Natural English: Upper-intermediate Student's Book. Oxford University Press, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.