Duckworth, M., O'Neill, R., & Gude, K. (1987). Success at First Certificate. The University Press.
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Citação norma Chicago
Duckworth, Michael, Robert O'Neill, and Kathy Gude. Success at First Certificate. Oxford: The University Press, 1987.
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Citação norma MLA
Duckworth, Michael, et al. Success at First Certificate. The University Press, 1987.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.