Guffey, M. E. (2000). Business communication: Process and product (3rd ed.). Cincinnati: South-Western College.
استشهاد بنمط شيكاغوGuffey, Mary Ellen. Business Communication: Process and Product. 3rd ed. Cincinnati: South-Western College, 2000.
MLA استشهادGuffey, Mary Ellen. Business Communication: Process and Product. 3rd ed. Cincinnati: South-Western College, 2000.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.