Gutjahr, L. (2007). English for telephoning. Oxford University Press.
Trích dẫn kiểu ChicagoGutjahr, Lothanr. English for Telephoning. Oxford University Press, 2007.
Deismireacht MLAGutjahr, Lothanr. English for Telephoning. Oxford University Press, 2007.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.