Dyfyniad APA

Guffey, M. E. (1991). Essentials of business communication (2nd ed.). PWS - KENT.

Dyfyniad Arddull Chicago

Guffey, Mary E. Essentials of Business Communication. 2nd ed. Boston: PWS - KENT, 1991.

Dyfyniad MLA

Guffey, Mary E. Essentials of Business Communication. 2nd ed. PWS - KENT, 1991.

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