Não informado. (1951). ETS Developments. Educational Testing Service.
Chicagoスタイル(17版)引用形式Não informado. ETS Developments. Princeton, NJ: Educational Testing Service, 1951.
MLA(8版)引用形式Não informado. ETS Developments. Educational Testing Service, 1951.
警告: この引用は必ずしも正確ではありません.