Boyd, E. (2009). Premium: C1 level (Coursebook). Harlow (England): Pearson education limited.
シカゴスタイル引用形Boyd, Elaine. Premium: C1 Level (Coursebook). Harlow (England): Pearson education limited, 2009.
MLA引用形式Boyd, Elaine. Premium: C1 Level (Coursebook). Harlow (England): Pearson education limited, 2009.
警告: この引用は必ずしも正確ではありません.