Geffner, A. B. (1991). Business letters the easy way. New York: Barron’s.
Trích dẫn kiểu ChicagoGeffner, Andrea B. Business Letters the Easy Way. New York: Barron’s, 1991.
Deismireacht MLAGeffner, Andrea B. Business Letters the Easy Way. New York: Barron’s, 1991.
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