Não informado. (1927). Bulletin of the International Bureau of Education. International Bureau of Education.
Style de citation Chicago (17e éd.)Não informado. Bulletin of the International Bureau of Education. Geneve, Suíça: International Bureau of Education, 1927.
Style de citation MLA (8e éd.)Não informado. Bulletin of the International Bureau of Education. International Bureau of Education, 1927.
Attention : ces citations peuvent ne pas être correctes à 100%.