ETHERTON, A. (1963). A graded secondary school english course. Longman.
Chicagoスタイル(17版)引用形式ETHERTON, A.R.B. A Graded Secondary School English Course. London: Longman, 1963.
MLA(9版)引用形式ETHERTON, A.R.B. A Graded Secondary School English Course. Longman, 1963.
警告: この引用は必ずしも正確ではありません.