Não informado. (1999). Shools in the middle. National Association of Secondary School Principals.
Chicagoスタイル(17版)引用形式Não informado. Shools in the Middle. Reston, Va: National Association of Secondary School Principals, 1999.
MLA(8版)引用形式Não informado. Shools in the Middle. National Association of Secondary School Principals, 1999.
警告: この引用は必ずしも正確ではありません.