Dumont, R. A., & Lannon, J. M. (1987). Business communications (2nd ed.). Little, Brown.
Lua i Stíl Chicago (17ú heag.)Dumont, Raymond A., agus John M. Lannon. Business Communications. 2nd ed. Boston: Little, Brown, 1987.
Lua MLA (9ú heag.)Dumont, Raymond A., agus John M. Lannon. Business Communications. 2nd ed. Little, Brown, 1987.
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