Lua APA (7ú heag.)

MCCOMAS D C. (1993). MODERN BUSINESS CORRESPONDENCE (6TH.). MACMILLAN.

Lua i Stíl Chicago (17ú heag.)

MCCOMAS D C. MODERN BUSINESS CORRESPONDENCE. 6TH. U.S.A: MACMILLAN, 1993.

Lua MLA (9ú heag.)

MCCOMAS D C. MODERN BUSINESS CORRESPONDENCE. 6TH. MACMILLAN, 1993.

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