Michael Duckworth. (1999). Countdown to first certificate ( Teacher's book ). Oxford: Oxford Univ. Press.
Trích dẫn kiểu ChicagoMichael Duckworth. Countdown to First Certificate ( Teacher's Book ). Oxford: Oxford Univ. Press, 1999.
MLA citiranjeMichael Duckworth. Countdown to First Certificate ( Teacher's Book ). Oxford: Oxford Univ. Press, 1999.
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