Guffey, M. E. (1995). Essentials of business communication (3rd ed.). South-Western College.
芝加哥风格引文Guffey, Mary Ellen. Essentials of Business Communication. 3rd ed. Cincinnati, Ohio: South-Western College, 1995.
MLA引文Guffey, Mary Ellen. Essentials of Business Communication. 3rd ed. South-Western College, 1995.
警告：这些引文格式不一定是100％准确.