Não informado. (1980). Principal. National Association of Elementary School Principals.
Chicagoスタイル(17版)引用形式Não informado. Principal. Arlington, Va: National Association of Elementary School Principals, 1980.
MLA(8版)引用形式Não informado. Principal. National Association of Elementary School Principals, 1980.
警告: この引用は必ずしも正確ではありません.