Não informado. (2002). Principal Leadership. National Association of Secondary School Principals.
Chicagoスタイル(17版)引用形式Não informado. Principal Leadership. Reston, Va: National Association of Secondary School Principals, 2002.
MLA(8版)引用形式Não informado. Principal Leadership. National Association of Secondary School Principals, 2002.
警告: この引用は必ずしも正確ではありません.