Watkins, F., & Hiers, J. (1989). Practical English workbook (4th ed.). Houghton.
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Citação norma Chicago
Watkins, Floyd, and John Hiers. Practical English Workbook. 4th ed. Boston: Houghton, 1989.
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Citação norma MLA
Watkins, Floyd, and John Hiers. Practical English Workbook. 4th ed. Houghton, 1989.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.