Julia Burchell. (2021). Cambridge Lower Secondary English Stage 9: Workbook. Collins.
Chicagoスタイル(17版)引用形式Julia Burchell. Cambridge Lower Secondary English Stage 9: Workbook. London: Collins, 2021.
MLA(9版)引用形式Julia Burchell. Cambridge Lower Secondary English Stage 9: Workbook. Collins, 2021.
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