Guffey, M. E. (1991). Essentials of business communication (2nd ed.). PWS - KENT.
芝加哥风格引文Guffey, Mary E. Essentials of Business Communication. 2nd ed. Boston: PWS - KENT, 1991.
MLA引文Guffey, Mary E. Essentials of Business Communication. 2nd ed. PWS - KENT, 1991.
警告：这些引文格式不一定是100％准确.