Não informado. (1947). Elementary English. National Council of Teachers of English.
Chicagoスタイル(17版)引用形式Não informado. Elementary English. Champaign, Ill: National Council of Teachers of English, 1947.
MLA(8版)引用形式Não informado. Elementary English. National Council of Teachers of English, 1947.
警告: この引用は必ずしも正確ではありません.