Wolf, M. P., & Kuiper, S. (1984). Effective communication in business (8th ed.). South - Western.
Lua i Stíl Chicago (17ú heag.)Wolf, Morris P., agus Shirley Kuiper. Effective Communication in Business. 8th ed. Cincinnati: South - Western, 1984.
Lua MLA (9ú heag.)Wolf, Morris P., agus Shirley Kuiper. Effective Communication in Business. 8th ed. South - Western, 1984.
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