Geffner, A. B. (2000). How to write better business letters (3rd ed.). Barron's Educational Series.
Citace podle Chicago (17th ed.)Geffner, Andrea B. How to Write Better Business Letters. 3rd ed. Hauppauge, N.Y: Barron's Educational Series, 2000.
Citace podle MLA (9th ed.)Geffner, Andrea B. How to Write Better Business Letters. 3rd ed. Barron's Educational Series, 2000.
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