Não informado. (1969). Today's education. National Education Association.
Chicagoスタイル(17版)引用形式Não informado. Today's Education. Washington: National Education Association, 1969.
MLA(8版)引用形式Não informado. Today's Education. National Education Association, 1969.
警告: この引用は必ずしも正確ではありません.