Não informado. (1971). Educational documentation and information. International Bureau of Education.
Chicagoスタイル(17版)引用形式Não informado. Educational Documentation and Information. Geneve, Suíça: International Bureau of Education, 1971.
MLA(8版)引用形式Não informado. Educational Documentation and Information. International Bureau of Education, 1971.
警告: この引用は必ずしも正確ではありません.