(1993). Business English certificate: A guide to the business English certificate. England: University of Cambridge.
استشهاد بنمط شيكاغوBusiness English Certificate: A Guide to the Business English Certificate. England: University of Cambridge, 1993.
MLA استشهادBusiness English Certificate: A Guide to the Business English Certificate. England: University of Cambridge, 1993.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.