Não informado. (1972). History. Helen Dwight Reid Educational Foundation.
Chicagoスタイル(17版)引用形式Não informado. History. Washington: Helen Dwight Reid Educational Foundation, 1972.
MLA(8版)引用形式Não informado. History. Helen Dwight Reid Educational Foundation, 1972.
警告: この引用は必ずしも正確ではありません.