Spencer, D. (1963). English for proficiency. Oxford University Pr.
Chicagoスタイル(17版)引用形式Spencer, D.H. English for Proficiency. London: Oxford University Pr, 1963.
MLA(9版)引用形式Spencer, D.H. English for Proficiency. Oxford University Pr, 1963.
警告: この引用は必ずしも正確ではありません.