Littlejohn, A. (1999). Cambridge English worldwide: Teacher's book. Cambridge, UK: Cambridge University Press.
Trích dẫn kiểu ChicagoLittlejohn, Andrew. Cambridge English Worldwide: Teacher's Book. Cambridge, UK: Cambridge University Press, 1999.
Deismireacht MLALittlejohn, Andrew. Cambridge English Worldwide: Teacher's Book. Cambridge, UK: Cambridge University Press, 1999.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.