Merriam, W. (1996). Merriam - Webster`s guide to business correspondence. Merriam -Webster.
Lua i Stíl Chicago (17ú heag.)Merriam, Webster. Merriam - Webster`s Guide to Business Correspondence. Springfiel d: Merriam -Webster, 1996.
Lua MLA (9ú heag.)Merriam, Webster. Merriam - Webster`s Guide to Business Correspondence. Merriam -Webster, 1996.
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