Não informado. (1912). American teacher. American Federation of Teachers.
Chicagoスタイル(17版)引用形式Não informado. American Teacher. Washington: American Federation of Teachers, 1912.
MLA(8版)引用形式Não informado. American Teacher. American Federation of Teachers, 1912.
警告: この引用は必ずしも正確ではありません.