Swan, M., & Walter, C. (1991). The Cambridge English Course: T. I. Student"s Book. New York: Cambridge University Press.
Dyfyniad Arddull ChicagoSwan, Michael, và Catherine Walter. The Cambridge English Course: T. I. Student"s Book. New York: Cambridge University Press, 1991.
Dyfyniad MLASwan, Michael, và Catherine Walter. The Cambridge English Course: T. I. Student"s Book. New York: Cambridge University Press, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.