Naterop, B. J., Haberfellner, E., & Weis, E. (1998). Business letters for all. New York: Oxford University press.
Trích dẫn kiểu ChicagoNaterop, Bertha J., Eva Haberfellner, và Erich Weis. Business Letters for All. New York: Oxford University press, 1998.
Deismireacht MLANaterop, Bertha J., Eva Haberfellner, và Erich Weis. Business Letters for All. New York: Oxford University press, 1998.
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