Não informado. (1926). Bulletin of the National Association of Secondary School Principals. National Association of Secondary School Principals.
Chicagoスタイル(17版)引用形式Não informado. Bulletin of the National Association of Secondary School Principals. Washington: National Association of Secondary School Principals, 1926.
MLA(8版)引用形式Não informado. Bulletin of the National Association of Secondary School Principals. National Association of Secondary School Principals, 1926.
警告: この引用は必ずしも正確ではありません.