English Languaje Services. (1964). The Key to english. Collier Macmillan.
Chicagoスタイル(17版)引用形式English Languaje Services. The Key to English. London: Collier Macmillan, 1964.
MLA(9版)引用形式English Languaje Services. The Key to English. Collier Macmillan, 1964.
警告: この引用は必ずしも正確ではありません.