Guffey, M. E. (1999). Business English (6th ed.). Cincinnati, Ohio: South-Western College.
Trích dẫn kiểu ChicagoGuffey, Mary Ellen. Business English. 6th ed. Cincinnati, Ohio: South-Western College, 1999.
ציטוט MLAGuffey, Mary Ellen. Business English. 6th ed. Cincinnati, Ohio: South-Western College, 1999.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.