Brock, S. L. (1996). Better business writing: Techniques for improving correspondence (3rd ed.). Crisp Publication.
Lua i Stíl Chicago (17ú heag.)Brock, Susan L. Better Business Writing: Techniques for Improving Correspondence. 3rd ed. California: Crisp Publication, 1996.
Lua MLA (9ú heag.)Brock, Susan L. Better Business Writing: Techniques for Improving Correspondence. 3rd ed. Crisp Publication, 1996.
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