Swan, M., & Walter, C. (1993). C: The New Cambridge : English Course : Teacher. Cambridge: Cambridge University.
Dyfyniad Arddull ChicagoSwan, Michael, và Catherine Walter. C: The New Cambridge : English Course : Teacher. Cambridge: Cambridge University, 1993.
Dyfyniad MLASwan, Michael, và Catherine Walter. C: The New Cambridge : English Course : Teacher. Cambridge: Cambridge University, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.