Não informado. (1971). Educational documentation and information. International Bureau of Education.
Style de citation Chicago (17e éd.)Não informado. Educational Documentation and Information. Geneve, Suíça: International Bureau of Education, 1971.
Style de citation MLA (8e éd.)Não informado. Educational Documentation and Information. International Bureau of Education, 1971.
Attention : ces citations peuvent ne pas être correctes à 100%.