(1993). Business English certificate: A guide to the business English certificate. England: University of Cambridge.
Παραπομπή Chicago StyleBusiness English Certificate: A Guide to the Business English Certificate. England: University of Cambridge, 1993.
Παραπομπή MLABusiness English Certificate: A Guide to the Business English Certificate. England: University of Cambridge, 1993.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.