Não informado. (2000). The Presidency. American Council on Education.
Chicagoスタイル(17版)引用形式Não informado. The Presidency. Washington: American Council on Education, 2000.
MLA(8版)引用形式Não informado. The Presidency. American Council on Education, 2000.
警告: この引用は必ずしも正確ではありません.