(1992). BBC Keys to Business English + 1 audio cassette. BBC English.
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Citação norma Chicago
BBC Keys to Business English + 1 Audio Cassette. London: BBC English, 1992.
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Citação norma MLA
BBC Keys to Business English + 1 Audio Cassette. BBC English, 1992.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.