Etherton, A. (1968). Objective english tests intermediate level. Longman.
Chicagoスタイル(17版)引用形式Etherton, A.R.B. Objective English Tests Intermediate Level. London: Longman, 1968.
MLA(9版)引用形式Etherton, A.R.B. Objective English Tests Intermediate Level. Longman, 1968.
警告: この引用は必ずしも正確ではありません.