Littlejohn, A. (1999). Cambridge English worldwide: Student's book. Cambridge, UK: Cambridge University Press.
Dyfyniad Arddull ChicagoLittlejohn, Andrew. Cambridge English Worldwide: Student's Book. Cambridge, UK: Cambridge University Press, 1999.
Dyfyniad MLALittlejohn, Andrew. Cambridge English Worldwide: Student's Book. Cambridge, UK: Cambridge University Press, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.